What is Activity: Definition and 191 Discussions

Paranormal Activity is a 2007 American supernatural horror film produced, written, directed, photographed and edited by Oren Peli. It centers on a young couple (Katie Featherston and Micah Sloat) who are haunted by a supernatural presence in their home. They then set up a camera to document what is haunting them. The film utilizes found-footage conventions that were mirrored in the later films of the series.
Originally developed as an independent feature and given film festival screenings in 2007, the film was shot for $15,000. It was then acquired by Paramount Pictures and modified, particularly with a new ending that cost an additional $200,000. It was given a limited U.S. release on September 25, 2009, and then a nationwide release on October 16, 2009. The film earned nearly $108 million at the U.S. box office and a further $85 million internationally for a worldwide total of $193 million. Paramount/DreamWorks acquired the U.S. rights for $350,000. It is the most profitable film ever made, based on return on investment, although such figures are difficult to verify independently as this is likely to exclude marketing costs.The film is the first (chronologically, the third) entry in the Paranormal Activity film series. A parallel sequel and prequel, Paranormal Activity 2, was released in 2010. The success of the first two films would spawn additional films in the series: the prequel Paranormal Activity 3 in 2011, and Paranormal Activity 4 (the sequel to the second installment) in 2012. The fifth installment, The Marked Ones, was released in 2014, and the sixth installment, The Ghost Dimension, was released in 2015.
On June 19, 2019, Paramount announced that a seventh installment is in development and would be released on March 19, 2021. However, in August 2020, it was announced it would be delayed to March 4, 2022 due to the COVID-19 pandemic.

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  1. Astronuc

    Colli Albani Volcanic District - recent activity

    Colli Albani (Alban Hills) is located 20 km (12 mi) southeast of Rome and about 24 kilometres (15 mi) north of Anzio. It has been considered a quiescent volcanic complex - until recently. An ancient volcano on the outskirts of Rome is showing signs of another enormous eruption – some time in...
  2. T

    What solution can simulate ocean acidification for a classroom demonstration?

    I would like to do a classroom demonstration using plaster of paris (or something similar) shells dissolving in a low pH solution, simulating ocean acidification. I would like the reaction to happen quite quickly in front of the classroom. What solution could I use to dissolve plaster of paris...
  3. Astronuc

    Low level seismic (swarm) activity at Mt Hood, Oregon

    A journalist reported a 'New Earthquake Swarm is Rocking Oregon's Mt Hood. http://www.wired.com/2016/05/new-earthquake-swarm-rocking-mt-hood I wouldn't say rocking. I checked USGS, and didn't find anything over Mag 2.5, so I refined the search in the range of Mag 1 to 2.5, and found a number...
  4. H

    Specific activity of radionuclides

    what is the formula to determine the specific activity of radionulcide in sediments
  5. Astronuc

    M6.0 - 68km SSW of Bunisari, Indonesia - Sunda Activity

    There's been some activity along the Sunda trench, the region where the Australia plate interacts with the Eurasia plate (Sunda Plate) along the southern border of Indonesia. I'm wondering if we'll see a Mag 7.0 or greater soon...
  6. D

    Thermodynamics- UNIQUAC activity coefficient model

    I was looking to find the volume( Rk) and surface area (Qk) parameter for an N-O bond in a pyridine N-oxide molecule?
  7. E

    Seizmic Activity & Quantum Gravity: LIGO Info & Plans

    1. Does LIGO give also any information about seizmic activity? (I think as aspect intended primary to seizmic activity, not in connection with gravitational waves.) 2. Will measurement of gravitational wave give any information about quantum gravity? Is here any plan for this usage?
  8. Astronuc

    News North Korea - Suspicious Seismic Activity

    Breaking News: North Korea claims it has conducted a successful hydrogen bomb test South Korea says "artificial earthquake" detected near North Korean nuclear testing site http://news.yahoo.com/earthquake-detected-north-korea-not-clear-nuke-test-020439757.html That will certainly stir...
  9. F

    Water activity meter reading over 1

    Good evening. I recently was taught how to use our new water activity meter, and I noticed something strange. This meter uses changes in the reflectance of a mirror. Whenever we'd bring the sample up to temperature, the measurement would reach a low point, then at about 0.5° below our set...
  10. J

    What is the mass of the activity?

    Homework Statement what is the mass in g of the activity? (a)1μCi 241Am Homework Equations A = λN λ = ln2 / T1/2 The Attempt at a Solution A = λN 1μCi = λN N=1μCi/λ N = ( x /241 mol) × (6.022 × 1023 nuclei mol-1 ) 1μCi/λ=( x /241 mol) × (6.022 × 1023 nuclei mol-1 ) X=1μCi (241)/λ(6.022×...
  11. Rectifier

    Yes, your solutions for both parts (a) and (b) are correct. Good job!

    The problem statement The Cobalt-60 isotope is often used in medicine. It has a half-life of 5.25 years. a) What is the activity of 1μg Cobalt in Bq (decays/second)? b) You find a sample of Cobalt that has a mass of 10 µg and has an activity of 5.0MBq. How old is that sample? This problem was...
  12. davenn

    A little solar activity this week

    Overall this Solar Max has been pretty disappointing. But occasionally the Sun as shown brief bursts of good activity over the last week, and for a few more days, there has been a large sunspot group traversing the solar face. AR2403 is a massive spot group and one of the largest this solar max...
  13. Tam Le

    Why Does Copper Not React with Lead Nitrate?

    According to my chemistry textbook, Cu will not be oxidized by Pb(NO3)2, for Cu is lower on the activity series relative to Pb; Cu will not react with Pb(NO3)2. Why is that? Copper should still be able to oxidize regardless of its position on the activity series. So, why does its position on...
  14. R

    Geiger counters and activity

    I'm doing high school physics and if a question says something like: A radioactive source gives count rate of 110 counts per second Can you say that the ACTIVITY is also 110 bq? My second question is how would a gieger counter detect gamma radiation? It is the least ionising of all three...
  15. X

    What is the specific activity of the air inside the sealed warehouse?

    Can anyone please guide me how to find solution of this problem A 0.2-g sample of 85Kr gas, which decays into stable 85Rb, is accidentally broken and escapes inside a sealed warehouse measuring 40×30×20 m. What is the specific activity of the air inside?
  16. majid313mirzae

    What is the activity quantity, for a experiment?

    I will do an experiment with a radiotracer,99Tc. The detector is NaI 1"*1". But I don't know how much of the radiotracer is nedded?
  17. D

    Activity of substance after a certain time

    Homework Statement A sample consists of 2g of a radioactive element. The molar mass of the element is 67g. If the half life of the element is 78 hours, the activity of the sample after 48 hours is ?Homework EquationsThe Attempt at a Solution d(N)/dt = -λN (2/67 x 6.02x10^23) (ln 2 )/ (78x...
  18. P

    Finding the Specific Activity of Rubidium Chloride

    Homework Statement The element rubidium consists of two isotopes, the stable 85Rb and radioactive 87Rb (abundance 27.83%). What is the specific activity of natural rubidium chloride? Use Ar85.47 gmol-1 for rubidium element, Ar 86.91 gmol-1 for 87Rb, and Mr 120.92 gmol-1 for RbCl. Homework...
  19. davenn

    Current Icelandic Volcanic Activity

    here's some awesome eruption video from the 4 Sept 2014 http://vimeo.com/105365343 cheers Dave
  20. Astronuc

    Catatumbo and frequent storm activity

    A region of Venezuela has a high incidence of recurrent thunderstorm activity. It is apparently a unique set of conditions - a lake surrounded by mountains, where winds blow in from the ocean, and the warm moist air combined with moisture from evaporation from the lake interacts with cooler...
  21. maistral

    Can SRK EOS Employ NRTL Activity Coefficients?

    What the title states. Is it possible? I can't seem to find a way (at least, from the massive stash of PDF files I downloaded about VLE/EOS) on how to employ NRTL activity coefficients with the Soave-Redlich-Kwong EOS. In other words, is there a way to get the activity coefficient models like...
  22. T

    Hyperbola Activity: Extending w/ Foci, Assymptotes & Point A

    I need to extend this activity somehow, but I forgot this stuff already? I learned this a long time ago, I think this activity is too simple so can someone tell me how to find the foci, assymptotes, etc, and what the "point a" is for...
  23. E

    Activity of Isotope: mCi, mR, Rem Value & Distance

    Hi all, how can I find the activity of isotope which it has in area given value mCi or mR or Rem value of this? ionization energy of isotope how many distance can it travel on air and in earth-ground when I know only the Curi or Rem or Roengen? ex. Who they calculate the...
  24. F

    Radioactive Decay - working out activity

    Homework Statement If you have 500g of Thorium-234 at t=0. Calculate the initial activity and the activity after 2 weeks. The half life of thorium-234 is 24 days. Homework Equations A=A_0e^{-\lambda t} \\ A_0=\lambda N_0 \\ \lambda=\frac{ln2}{t_{\frac{1}{2}}} The Attempt at a Solution For the...
  25. A

    Activity of photon during wavelegnth duration

    (disregard my improvised science lingo) so like... a radio wave has a rather macroscopic wavelength. the photon is depicted as traveling back and forth in unison with the wavelength. I am having trouble understanding why the photon can't hit you from the "side". if the photon is traveling a...
  26. V

    Optical Activity: How Do Chiral Molecules Rotate Light?

    "Optical activity is the tendency of chiral molecules to rotate ppl" how does a chiral molecule rotate light? Is it because of interaction of electric fields? Anyone please help me? I just need to know how a molecule physically does that?
  27. A

    When does gluconeogenesis kick in during physical activity?

    Hello, I'm a dietetics student, and my course is really unclear about gluconeogenesis regulation, and exactly WHEN it happens. What my coursebook teaches me is that glycogenolysis is the main purveyor of energy during physical exercise, and it is triggered by LOW INSULIN, HIGH GLUCAGON and...
  28. S

    Star formation activity and SMBH activity

    Hello everybody, I'm new here and i have a question about the activity of our galaxy's Supermassive Black Hole. Did it influence the star-formation activity or was it vice versa? I would be grateful if someone could tell me anything about this or give me some information directions. Thank you.
  29. B

    Expressing Rates of S's Phase Transition: P1, T1, and Activity of S (Phase 1)

    Let's say I have a general phase transition S (phase 1) ::equil:: S (phase 2). At a certain point in pressure and temperature for each phase (they can have different pressures and temperatures, we might say P1 and T1 for phase 1 and P2 and T2 for phase 2), how might we express the forward and...
  30. Aab e Hayat

    How to Calculate Energy of alpha particle from its Activity

    I am given with the activity of alpha particle.How could i calculate its energy from it?
  31. T

    Calculating Carbon-14 Activity for Archaeological Samples

    Homework Statement 1) What would you expect the Carbon-14 activity (in counts/minute) to be for a 1.0g sample of Carbon from a 4000-year-old Bristle pine cone? 2) What would you expect the Carbon-14 in counts/minute to be for a 20g sample of carbon from a 10000 year old fireplace found in...
  32. C

    What Does Unusual Auroral Activity Mean in Astronomy?

    Hi, I am a newbie trying out astronomy after two decades of politics, but I was hoping if someone could help translate the following statement for me (I am not a student, so your not answering an essay question or anything); We report unusual auroral features observed by the DMSP-F6...
  33. W

    Question on Radioactivity, Activity and Age Estimations.

    Hi all, my end of year Physics exam is tomorrow and I need some help on this question and if someone could help I'd appreciate it. Carbon-14 has a half life of 5730 years, and an equilibrium concentration in the Earth’s lower atmosphere of approximately one atom per 8.3 x 1011 atoms of normal...
  34. W

    Calculating Activity of proton beam

    Homework Statement A natural lithium target 3.8 mg cm-2 thick is bombarded with a 125 µA beam of 3.5 MeV protons initiating a 7Li(p,n) reaction. Assuming a reaction cross section of 300 mb, calculate the activity produced by a 15 minute bombardment. Homework Equations...
  35. J

    Change in Earth's axis and Rotation due to tectonic activity

    Since the redistribution of mass in the Earth's surface can be caused by earthquakes, sometimes the Earth's rotation is increased or decreased by a small amount. Recent series of quakes seem to be related. To me, this makes sense, since if plate "A" should move, then plate "B" would also...
  36. S

    Nuclear decay activity - value for money?

    Homework Statement Radioactive nuclei A are produced at a rate R per second in a nuclear reactor. They decay with probability λ per second. (Qu 1-2 involving deriving the rate of change and number particles at any given time, I've done this). 3) Show the activity tends to R, a constant, as...
  37. N

    Estimating Tracheal Volume Flow: Physics Activity for Adults | Fun Activity

    Fun physics activity! Homework Statement Under the conditions of normal activity an adult inhales about 1.1l of air during each inhalation. Using a stopwtch, determien the time for one of your own inhalations (avg several to get two significant digits) and hence estimate the volume flow in...
  38. G

    How Does Solvent Type Affect the Activity of 2-Pentanone?

    Hey everyone, I need help with this question: Homework Statement 2-pentanone is an important industrial intermediate. When using the pure liquid as the reference state, in which solvents (examples and explanations) would you expect it to have an activity of a) less than one, b) one...
  39. O

    Can someone explain conserved quantities in this activity

    Hello, Can Someone help me with this activity - http://www.particleadventure.org/other/education/five_s.html - its activity 5 The rules of the Game The answer to the activity is - http://www.particleadventure.org/other/education/five_s.html I don't understand how they got the answer for...
  40. P

    How does brain activity affect energy usage?

    I'm curious to know how much energy a brain will use depending on the different activities it's doing. Sleeping vs. watching TV vs. doing rigorous physics problems vs. running a marathon For the above activities, what are the different energy requirements like? How do the things...
  41. A

    Can You Determine an Epicenter in a Classroom Seismic Activity Simulation?

    Seismic Activity Project! Please help me! So, I have to find the location of the epicenter of seismic activity. Of course, our project does not intend to find that of real seismic activity. This is a school project, in which my teacher will drop an object at some unknown location in a large...
  42. D

    Solar Activity Trends: Historical Chart and Validation for Current Increase

    Hi, I'm looking for a general solar activity chart that covers as much history as possible (up to this month or even better today). In a nutshell, I am looking to validate if we are in fact in a period of increasing solar activity which would apparently keep increasing until next year ...
  43. M

    Radioactive Activity of a Gamma source

    Homework Statement The issue I have is that I am asked to estimate the activity of a small source of gamma radiation; the question is written below: 'A small source of gamma radiation is placed at a distance of 160mm from a detector of area 18mm^2. The count recorded on the detector after 30...
  44. M

    Activity and chemical potential

    hi, can someone help me in understanding the difference between chemical potential and activity? Why it is important to know/determine activities of certain species in material growth? Given that activity is dimensionless quantity, what is it measuring? Also, what is the activity of pure...
  45. A

    Is activity in radioactive decay a differential?

    According to my textbook, the decay constant is the probability that a radionuclide will decay in any second (hence the unit s^-1) and so the total number of radionuclides decaying at any second, i.e. the activity, is λN but this is also the rate of change of N thus dN/dt = -λN Surely...
  46. D

    Lab Activity: Conservation of Momentum

    Homework Statement Suppose we have done a conservation of momentum lab the smart pulley apparatus shown in the figure provided. With this apparatus we can time the motion of cart #1 very accurately. In the beginning cart #2 was stationary. We set cart #1 in motion by giving it a slight push...
  47. A

    Electrical activity of an atom

    the electrical activity of an atom is the same electricity of a light bulb?
  48. E

    Calculating activity coefficients

    The measured pH of 0.100 M HCl at 25°C is 1.092. From this information, calculate the activity coefficient of H+. I tried using the Debye-Huckel equation and got 0.825 but it's not right. I don't know how else to solve for the activity coefficient.
  49. G

    When Daughter Activity Becomes Equal To Parent Activity

    Hi. New here (Again). I'm having trouble with solving transient equilibrium problem e-0.0495t= 0.0289 (e-0.0495t- e-0.0289t) _____________ 0.0289-0.0495 I know the answer but can't seem to make this work. Maybe I'm messing up my order of op.
  50. K

    How do scientists monitor the Sun's activity?

    Hello! I just want to humbly ask how do scientists and agencies like NASA, ESA, etc. monitor the activity of our Sun? For example, if Solar storms are occurring in the Sun, how do we know it from Earth? And another specific question: We know that in about 5 billion years (is this...
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