Modern physics Definition and 249 Threads

I need to choose a topic from any theories from quantum physics and write an essay about 500-1000 words and present it to the class. Because this assignment is for summer school, my teacher doesn't want it to be too complicated but at the same time interesting enough for a 10 minute...

Homework Statement This problem is from Modern Physics by Kenneth Krane 2nd ED The problem is: An atom of mass m moving in the x direction with speed v collides elastically with an atom of mass 3m at rest. After the collision the first atom moves in the y direction. Find the direction of...

Homework Statement The potential energy "V" of NaCl can be described empirically by: V = -(e2/(4*Pi*epsilon)) + A*exp[-R/rho] where R is the internuclear separation. The equilibrium separation of the nuclei Ro is 2.4 Angstroms and the dissociation energy is 3.6 eV. a) Calculate A and...

Is there any other formally considered theories relating to the operations of gravity other than relativity? They must still be considered in modern physics. If so could one point me in the direction.

Homework Statement ** My book doesn't have any solutions in the back , and I trying to find out if I am doing the problems correctly. My book is Modern Physics for Scientists and Engineers by John C. Morrison. If you know anywhere I can find the Answers. I would greatly appreciate it! The...

Homework Statement Suppose that a beam of light consists of photons having an energy of 5.4 eV. what is the wavelength of the light? Homework Equations hc = 1240 eV*nm E = \frac{hc}{\lambda} The Attempt at a Solution 5.4eV = \frac{1240eV*nm}{\lambda} \lambda =...

Homework Statement Find the length of the smallest standing wave that can be formed with light having a frequency of 600THZ. Homework Equations f = 600*10^{12}Hz c = 2.998x10^{8}\frac{m}{s} \lambda f=c The Attempt at a Solution \lambda f=c \lambda...

Homework Statement Suppose that an electron has a kinetic energy of 1.0 eV. What are the speed and the momentum of the electron? The book is Modern Physics for Scientists and Engineers by Morrison. If anyone knows where to get any of the answers(or solutions. solutions may be harder to...

Homework Statement Determine the current in the wolfram filament with the diameter 0.8 mm and the temperature T=2800K, which is maintained constant. Specific electrical resistance of the filament is ρ = 0.92⋅10-4Ohm⋅cm. The temperature of environment is t = 17C. Homework Equations...

What is needed from basic physics to study modern physics ?

Apparently my college doesn't offer the same intro physics courses in both semesters, and they suggest that physics majors take physics starting in their first year. Well, I never really considered being a physics major and opted to have a more liberal curriculum my first semester. It's kind of...

I am going to take an intro modern physics course which includes these topics in syllabus: -intro to relativity & quantum theory -Schroedinger equation -particle/wave duality -statistical physics: Bose and Fermi distribution My assigned textbook is Concepts of Modern Physics by Arthur...

Modern Physics, homework, please help:( A metal surface with a work function of (W1=3eV) is illuminated with a monochromatic ultraviolet light of frequency v*1. The maximum speed of the ejected photo electrons was found to be v1=0.6x10^6m/s. a) compute the wavelength λ of the incident...

What topics are typically covered in a 300 level modern physics class?

I'm taking Modern Physics in the spring semester (starts Jan 10). It's been over 5 years since I took Mechanics and EM. Which topics from these courses should I review in preparation for Modern Physics? I plan to review everything, however this will take me longer than the time available before...

I'm taking Modern Physics in the Spring semester (starts Jan 10). It's been over 5 years since I took Mechanics and EM. Which topics from these courses should I review in preparation for Modern Physics? I plan to review everything, however this will take me longer than the time available...

What is importance of finding E/M? I am doing a project on E/M and helmholtz coil. I heard that E/M is beginning of the Modern Physics. Can you tell me more about this experiment and why is it so important to know this ratio? I also want to be refereed to some sources in which i can get whole...

Homework Statement According to Bohr's atomic model, 1)Determine the allowed radius of the orbit of the electrons. Calculate the radius of the first orbit for the hydrogen atom. 2)Show that the energy of the electron is quantized. Calculate the energy corresponding to an electron on the first...

Homework Statement An electron with energy 10^3 MeV collides with a photon whose wavelength corresponds to the maximum wavelength of the 2.7-K cosmic background radiation. What is the maximum energy loss the electron can suffer as a result of the collision? What is the wavelength of the photon...

Homework Statement A particle with a rest energy of 2400 MeV has an energy of 15 GeB (15x10^9 eV). Find the time in Earth's frame of reference necessary for this particle to travel from Earth to a star four light-years distant. Homework Equations The Attempt at a Solution I...

Homework Statement A beam of pions (\pi-mesons, with rest energy m\pi c2=140 MeV) consisting of 1010 pions/cm^2s moves with speed such that the total energy of each pion is 10^5 MeV. What is the pressure the beam exerts on a surface that absorbs it and brings it to rest? Please note: For...

Physics for Scientists and Engineers vs "" with Modern Physics Would anyone know if there is a difference between the two books off the top of their head? LINK: https://www.amazon.com/dp/0495827819/?tag=pfamazon01-20 LINK: https://www.amazon.com/dp/1439048444/?tag=pfamazon01-20 I mean one...

Hello, I am attending the Modern Physics class at my college, and I am struggling to process all of the information the instructor is presenting. Part of that confusion stems from this being a summer course, the other part is from the sheer lack of organization. One second were deriving a...

Hi, I'm not sure if this is the right place to post this. Are other different axiomatic systems used for QM & GR? I mean, as I'm currently a high school student, all theorems I've learned are proved by the same set of axioms. I wonder if another applicable axiomatic system is used for...

I am a physics enthusiast and want to acquire as much knowledge in this area (I am in penultimate year of high school in Romania and want to continue with a college physics, but until then try to learn as much as possible). I want to know more about modern physics (relativity, quantum...

Well, I was hoping for an A- :frown:, because I thought my exam grades (22/25, 20/25, 22/25) might have warranted it even though my homework average (maybe 40/50) wasn't that great. Actually, now that I'm looking at it, it seems it was a pretty rigid grade and there probably wasn't much "curve,"...

Hi I am in my freshmen year and I am taking a course on Modern Physics. We use the book "Concept of Modern Physics" by Arthur Beiser. I have huge problem understanding the wave and particle dual properties of matter. And now we are about to start Quantum Mechanics. it seems further...

URGENT HELP NEEDED - Last Modern Physics I exam tomorrow I've done reasonably well in the class so far. However, I have not done well since starting modern quantum mechanics. The last several problem sets have covered quantum mechanics, and I failed Problem Set 6. I've never failed anything in...

Homework Statement Derive an expression for the total energy required to asemble a sphere of charge corresponding to a nucleus of atomic number Z and radius R. Assume the nucleus is a sphere of uniform volume charge density \rho Homework Equations \rho = mass / volume = 3Am / 4*pi*R3...

Arthur Beiser in His Modern Phyics books, says that there is absoluteness of past and future. If Event 1 occurs after event 2 in a given frame of reference, Then same sequence occurs in very other frame of reference. Thats not always true, isn't it?

Homework Statement Show that the form of Newton's Second Law is invariant under: (a). a Galilean Transformation (GT) in 1-Dimension. (b). a Galilean Transformation (GT) in 2-Dimensions. (c). a Galilean Transformation (GT) in 3-Dimensions. Homework Equations Newton's Second Law...

It took me a while to finish reading http://prst-per.aps.org/abstract/PRSTPER/v6/i1/e010101" {you can get free access to the paper}, and I still don't have a clear idea of it rather than the conclusion that stated that if the instructor doesn't make any explicit discussion on the interpretation...

Modern Physics question! Homework Statement When radiation of wavelength 350nm is incident on a surface, the maximum kinetic energy of the photoelectrons is 1.2ev. What is the stopping potential for a wavelength of 230nm? Homework Equations \phi=hc/\lambda-eV0( V0= V 'nought') I am...

Homework Statement Conventionally, the Galilean Transformation relates two reference frames that begin at the same location and time with one reference frame moving at a constant velocity {\vec{v}} along a positive {x}-axis (which is common to both reference frames) with respect to the other...

Just curious, what's the difference? I was told be someone that modern physics has ways of accurately defining what a force is, while classical physics does not define forces, only acceleration in terms of force and mass. Again, just curious.. What are the major differences? Is one wrong...

http://i46.tinypic.com/r9ha92.jpg it looks like a coordinate i don't know what is the meaning of this thing ?

I'm taking these next semester. I'm taking Differential Equations right now, so I'll have that under my belt.

I was wondering if anyone can provide me with literature that resolves the issue of free will as brought forth by modern physics, ie. the fact that atomic processes cannot be fully determined. Thank you for your concern,

Hello, First off, I would like to say thank you for being of much help as I browsed these forums a little and gained some information. Second, I would like to say that at this in point of time my understanding of Physics is limited, so I do not intend to put myself across as...

Here's the description of a class I'm taking next semester: Electrons, protons, and structure of matter: a historic view. The Rutherford-Bohr atom and elements of quantum mechanics and their applications to atomic, nuclear, and solid state physics. Usually offered every spring. Prerequisite...

What is a good introductionary textbook for "modern physics?" I am looking for a decent introductionary textbook to the various topics that get introduced in the first course after the classical mechanics(ie. a textbook targeted towards the student typically in the 4th semester in an undergrad...

In my modern physics course we learn that different atoms and molecules have a unique set of allowed orbitals where it's electrons are allowed to exist. We then talk about how this corresponds to unique spectral lines emitted and absorbed by the different atoms/molecules. This continues onto...

I am writing a paper on a "modern" modern physics experiment and need some help on finding a subject to write about. Any help on finding a topic would be greatly appreciated. Thank you in advance.

I am writing a paper on a "modern" modern physics experiment and need some help on finding a subject to write about. Any help on finding a topic would be greatly appreciated. Thank you in advance.

[FONT="Comic Sans MS"]hello everybody . i have an exam in modern physics ,about relativistic kinematics and relativistic dynamics and quantum effects . but i have some difficulties when solving problems and i'd like to work it more . so if anyone knows an interesting link or a free ebook where i...

Light of 300 nm wavelength strikes a metal plate, and photoelectrons are produced moving as fast of 0.002c. What is the work function of the metal?

Homework Statement This problem is giving me a headache and unfortunately I can't find any example that is similar to it. A hydrogen atom is in the n = 3, l = 2 state. (a) What are the possible values of j? (b) What are the possible values of the magnitude of the total angular momentum...

Hello everyone, I am a software engineer by profession. However, I would love to teach myself Physics and would like to gain a deeper understanding of modern physics. I know it is quit a daunting tasks but I am determined to make it happen, even if it takes a few many years! I understand that...

Hi Everyone... I need some help. I have read everyones threads on textbooks for modern physics. I am currently writting a new course in modern physics for my high school. The problem I am having is finding a textbook, or even several smaller books that do not use calculas. I am hoping to...

Does anybody know of a good "Modern Physics" textbook, to be used for a sophomore-junior Physics course in Modern Physics? I had once used Krane's "Elementary Modern Physics" (long time ago) but it was not a real textbook. I have seen he has a new edition of "Modern Physics", I don't know...