What is Photo: Definition and 505 Discussions

A photograph (also known as a photo) is an image created by light falling on a photosensitive surface, usually photographic film or an electronic image sensor, such as a CCD or a CMOS chip. Most photographs are created using a smartphone/camera, which uses a lens to focus the scene's visible wavelengths of light into a reproduction of what the human eye would see. The process and practice of creating such images is called photography.

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  1. W

    A: Calculating Photon Count from Electrical Energy and Efficiency

    Homework Statement In converting electrical energy into light energy, a sixty-watt incandescent light bulb operates at about 2.2% efficiency. Assuming that all of the light is green light (wavelength approximately 5500 Å), determine the number of photons per second given off by the bulb and...
  2. U

    Ideas for cool Kinematics Photo

    i have to take a photo demonstrating a Kinematics Phenomena. I do one every unit but this unit is really sutmping me. For the optics unit i took a picture of a laser bending through glass, for waves i took a picture of light interfering through a diffraction grating, for electricity i took a...
  3. Andre

    VOTE PF PHOTO CONTEST - Framing

    Please have a look at these pictures and see how natural framing can make the difference. Please vote for the best natural framed picture. 1. Matthyaouw 2. Edward http://img171.imageshack.us/img171/3497/1000586q.jpg 3. Borek 4. Gokul43201 5. Fuzzyfelt 6. Marzena...
  4. B

    Effect of Intensity and Frequency on Photoelectric Current

    what will be the effect on photoelectric current if the intensity and frequency of incident photons are increased simultaneously. ? Will the current remain almost same? if so , why?
  5. matthyaouw

    VOTE PF PHOTO CONTEST - Farmyard animals

    1.ZapperZ http://img17.imageshack.us/img17/7481/img2028gm.jpg 2.Matthyaouw 3.Andre 4.Borek 5.Marzena Contest Thread
  6. matthyaouw

    PF PHOTO CONTEST - Farmyard animals (oct 17-24)

    Farmyard animals Photos with farmyard aanimals on them, please :) Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me...
  7. matthyaouw

    VOTE PF PHOTO CONTEST - Putting things in perspective

    1.Borg 2.ZapperZ 3.AbstractPacif http://img48.imageshack.us/img48/5168/img0962y.jpg 4.Andre 5.Fuzzyfelt 6.Marzena 7.Borek 8.Sganesh88 http://img26.imageshack.us/img26/674/28567437.jpg Contest Thread
  8. matthyaouw

    VOTE PF PHOTO CONTEST - Three's a crowd

    1.ZapperZ 2.Ms Music 3.Hypatia 4.Andre 5.Borek 6.Marzena Contest Thread
  9. matthyaouw

    PF PHOTO CONTEST - Putting things in perspective (oct 10-17)

    Normal service resumes, contests starting on a saturday again Putting things in perspective Photos with strong perspective, odd perspectives etc etc. Be as creative as you like. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within...
  10. matthyaouw

    PF PHOTO CONTEST - Three's a crowd (oct 4-11)

    Three's a crowd Photos with crowds of three or more this week Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me...
  11. matthyaouw

    VOTE PF PHOTO CONTEST - Something New

    1.Andre 2.Borek 3.Marzena 4.Edward http://img134.imageshack.us/img134/8771/copyof1001517.jpg 5.Borg 6.Physics girl phd 7.Turbo-1 8.Matthyaouw 9.Kronos5253 Contest Thread
  12. matthyaouw

    PF PHOTO CONTEST - Something New (sept 27-oct 4)

    Something new The only restriction this week is that is must be a new photograph, taken between now and the close of the contest. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or...
  13. matthyaouw

    VOTE PF PHOTO CONTEST - Green Living

    1.Andre 2.ZapperZ 3.Borek 4.Marzena 5.Edward http://img529.imageshack.us/img529/5134/a0099bw8.jpg Contest Thread
  14. matthyaouw

    PF PHOTO CONTEST - Green living (sept 19-26)

    Green living Interpret as you will. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2. Please resize your...
  15. matthyaouw

    VOTE PF PHOTO CONTEST - Made of stone.

    1.jgens http://img12.imageshack.us/img12/6505/cimg0017c.jpg 2.Hypatia http://i82.photobucket.com/albums/j269/hypatia3811/henryfordhomenatsteppingstones.jpg 3.Marzena 4.Human4d 5.Equate http://img34.imageshack.us/img34/4293/brooklynbridgez.jpg 6.ZapperZ 7.Fuzzyfelt...
  16. matthyaouw

    PF PHOTO CONTEST - Made of stone (sept 12-19)

    Made of stone Show me something manmade that is made of stone. I couldn't come up with a catchier name. Sorry, I'm tired. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or...
  17. matthyaouw

    VOTE PF PHOTO CONTEST - Something fishy

    1.Integral 2.Matthyaouw 3.ZapperZ 4.Borek 5.Andre Contest Thread
  18. matthyaouw

    PF PHOTO CONTEST - Something fishy (sept 6-12)

    Something fishy Interpret as you will Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2. Please resize...
  19. matthyaouw

    VOTE PF PHOTO CONTEST - Around the house

    1.ZapperZ 2.Andre 3.Johnathan Scott 4.Matthyaouw 5.Marzena http://www.bpp.com.pl/IMG/marzena_around_the_house.jpg 6.Borek 7.Ivan Seeking http://img32.imageshack.us/img32/3034/light2k.jpg 8.Edward http://img154.imageshack.us/img154/7924/copyofscan10001001.jpg...
  20. matthyaouw

    PF PHOTO CONTEST - Around the house (Aug 29-Sep 5)

    Around the house Get creative with what you've got close to hand. Show me photos taken within the walls of your house. Not in the garden, not the view out the window but what's actually inside it. Get snapping :smile: Contest Rules: 1. Any digital photo or digitally-scanned photo...
  21. matthyaouw

    VOTE PF PHOTO CONTEST - Summer holidays

    1.Ivan Seeking http://img191.imageshack.us/img191/3980/1005z.jpg 2.Shramana http://img259.imageshack.us/img259/2981/summer09194.jpg 3.Waht http://img259.imageshack.us/img259/1914/1251085461img2156.jpg 4.Hypatia http://i82.photobucket.com/albums/j269/hypatia3811/HPNX0051.jpg...
  22. matthyaouw

    PF PHOTO CONTEST - Summer Holidays (aug 22-28)

    Summer Holidays Show me where you've been on your holidays this summer. If you've not not been away this summer, show me any previous trip away. Tell me a bit about where you went too :smile: Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be...
  23. matthyaouw

    VOTE PF PHOTO CONTEST - In to the light

    1.Borek 2.Ivan Seeking http://img25.imageshack.us/img25/8674/1011her.jpg 3.Chroot http://lh3.ggpht.com/_y270vw9jgGs/SodU2fbmGYI/AAAAAAAAHhE/tUWSnmcy9C0/s640/DSCR-3213.jpg 4.Integral 5.Andre 6.Marzena 7.Billiards http://img38.imageshack.us/img38/9206/12p1010324.jpg 8.Hypatia...
  24. matthyaouw

    PF PHOTO CONTEST - In to the light (aug 15-22)

    In to the light I've heard it said that it is not a good idea to shoot into the light when taking photos but I don't know, I think it can be pretty cool. Show me photos taken pointing towards the sun or your light source. Contest Rules: 1. Any digital photo or digitally-scanned photo...
  25. matthyaouw

    VOTE PF PHOTO CONTEST - Make me smile.

    Oh god, cute overload. Vote for the picture(s) that makes you smile the most. 1.Ivan Seeking http://img80.imageshack.us/img80/7281/isaac.jpg 2.Junglebeast http://img193.imageshack.us/img193/21/trollsp.jpg 3.RobertM 4.Ben Niehoff 5.Integral 6.Turbo-1 7.ZapperZ...
  26. matthyaouw

    PF PHOTO CONTEST - Make me smile (aug 8-15)

    Make me smile The challenge this week is to make me (and the voters) smile. Votes should go to the one(s) that made you smile the most. No other restrictions on subject. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the...
  27. matthyaouw

    VOTE PF PHOTO CONTEST - Chiaroscuro

    1.Brewnog 2.Chroot 3.Turbo-1 4.Ivan Seeking http://img40.imageshack.us/img40/5789/1043n.jpg 5.ZapperZ Contest Thread
  28. Andre

    PF PHOTO CONTEST - Chiaroscuro (Aug 2 - Aug 9)

    Note: Matthyaouw is offline for sometime due to technical problems and I offered to take over until he is back. Chiaroscuro Chiaroscuro(italian) is a term in art for a contrast between light and dark. An another form is Rembrandt lighting. So this week, it is about the nicest picture of...
  29. Andre

    VOTE PF PHOTO CONTEST - Home turf

    Note: Matthyaouw is offline for sometime due to technical problems and I offered to take over until he is back. Please, cast your vote. 1. junglebeast http://img193.imageshack.us/img193/626/turf.jpg 2. chroot...
  30. matthyaouw

    PF PHOTO CONTEST - Home turf (Jul 26- Aug 2)

    Back from my travels now so thanks to those who ran this for me while I was away. Home Turf I know we've had a similar contest before, but I fancied revisiting it. Show me your home turf. Your city, your street, anywhere close to where you live or lived. I will post the voting thread next...
  31. matthyaouw

    VOTE PF PHOTO CONTEST - Food & Drink

    Hello, I'm back from my travels. Thanks to Kurdt for taking over from me while i was gone. 1.Turbo-1 2.Andre 3.GeorginaS 4.ZapperZ Contest Thread
  32. K

    Photo Contest - Food & Drink (18th - 25th July)

    Food & Drink We've had a couple of these in the past but I'm sure you all have plenty of food themed pics. matthyaouw should be back next week, in which case normal service will be resumed. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be...
  33. K

    VOTE PF PHOTO CONTEST - Stormy Weather

    GeorginaS Greg Bernhardt https://www.physicsforums.com/misc/swiss.jpg colonelcrayon http://img11.imageshack.us/img11/62/1070768.jpg ZapperZ Andre Marzena Borek edward http://img199.imageshack.us/img199/333/stormr.jpg moose I'm afraid Ben's had to be disqualified...
  34. K

    Photo Contest - Stormy Weather (11th - 18th Jul)

    Stormy Weather Here is a very broad easily interpreted topic. :smile: Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me...
  35. K

    VOTE PF PHOTO CONTEST - Fly me away

    junglebeast http://img34.imageshack.us/img34/9237/flyo.jpg Andre ZapperZ colonelcrayon http://img193.imageshack.us/img193/3856/p3110203.jpg Ok small list this week. Vote away! :smile:
  36. matthyaouw

    PF PHOTO CONTEST - fly me away (Jul 4-11)

    Fly me away Interpret as you will Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2. Please resize your...
  37. matthyaouw

    VOTE PF PHOTO CONTEST - Out the window

    1.Chroot 2.Turbo-1 3.Junglebeast http://img20.imageshack.us/img20/9836/lifewasgood.jpg 4.Wildman 5.ZapperZ http://img20.imageshack.us/img20/9955/img5958l.jpg 6.Borek 7.Matthyaouw 8.Marzena 9.Andre 10.Fuzzyfelt...
  38. matthyaouw

    PF PHOTO CONTEST - Out the window (jun 27- jul 4)

    Out the window Interpret as you will Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2. Please resize your...
  39. matthyaouw

    VOTE PF PHOTO CONTEST - The Blues

    1.Integral 2.Colnelcrayon http://img189.imageshack.us/img189/7896/whittierblackstone16.jpg 3.Equate http://img195.imageshack.us/img195/9262/02222x.jpg 4.Edward http://img4.imageshack.us/img4/7639/copyof1000135.jpg 5.ZapperZ 6.Andre 7.Borek 8.Marzena...
  40. matthyaouw

    PF PHOTO CONTEST - The blues (june 20-27)

    The blues Interpret as you will Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2. Please resize your digital...
  41. matthyaouw

    VOTE PF PHOTO CONTEST - Hello Stranger

    1.Marzena 2.Integral 3.Jasonrox http://img30.imageshack.us/img30/6757/img0676k.jpg 4.Borek 5.ZapperZ 6.Matthyaouw 7.GeorginaS 8.Turbo-1 Contest Thread
  42. I

    Maximizing Speed: Understanding the Pendulum Motion

    The top point reached, is the max. speed obtained. Am i wrong? I am new into physics.
  43. matthyaouw

    What's in a Name? The PF Photo Contest for Strangers

    Hello stranger! Photos of people you don't know. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2. Please...
  44. matthyaouw

    VOTE PF PHOTO CONTEST - Wheels

    1.ZapperZ 2.Junglebeast http://img37.imageshack.us/img37/246/p9031294.jpg 3.Edward http://img266.imageshack.us/img266/1535/1001344jpgwheels.jpg 4.Cyrus http://img38.imageshack.us/img38/4954/wheelm.jpg 5.Andre 6.Moose 7.Brewnog 8.Borek 9.Matthyaouw...
  45. matthyaouw

    PF PHOTO CONTEST - Wheels (June 7-13)

    Wheels Wheels are the theme this week. Sorry it's late. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2...
  46. matthyaouw

    PF PHOTO CONTEST - Motion (may 30- june 6)

    Motion Photos that convey a sense of movement or motion please. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first...
  47. matthyaouw

    VOTE PF PHOTO CONTEST - Alphabetical order

    1.Borek A is for acid and alkali 2.ZapperZ B is for baseball 3.George Jones C is for C (the speed of light) http://img43.imageshack.us/img43/9248/lightspeed.jpg 4.Turbo-1 D is for ducks 5.Ms Music E is for entertainment, and eeeeek! 6.Marzena F is for fog...
  48. matthyaouw

    PF PHOTO CONTEST - Alphabetical order

    Alphabetical order Person one posts something beginning with A, person two posts something beginning with B, then C and so on and so forth. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a...
  49. matthyaouw

    VOTE PF PHOTO CONTEST - Night lights

    1.Marzena 2.ZapperZ 3.Equate http://img196.imageshack.us/img196/6771/bellagio.jpg 4.Signerror 5.MattRSK 6.Turbo-1 7.Galatea 8.Andre 9.Matthyaouw 10.Borek Contest Thread
  50. matthyaouw

    PF PHOTO CONTEST - Night lights (may 16-23)

    Night lights Photos at night, with things that are light. Interpret as creatively as you like. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is...
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