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anonymous

  • one year ago

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    @dan815

  3. dan815
    • one year ago
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    ok yep?

  4. dan815
    • one year ago
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    what is the question

  5. anonymous
    • one year ago
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    so when i put all the values in the calc i dont get excat answer as tht

  6. dan815
    • one year ago
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    http://www.wolframalpha.com/input/?i=4.14*10^-15+*3*10^8%2F2.55

  7. dan815
    • one year ago
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    seems to be right

  8. anonymous
    • one year ago
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    no i mean the answer is right but this is what i get when i put in the excat value

  9. arindameducationusc
    • one year ago
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    what do you get?

  10. anonymous
    • one year ago
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    4.8705*10^-7

  11. arindameducationusc
    • one year ago
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    okay lets do by this way.....

  12. arindameducationusc
    • one year ago
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    multiply by 4.14*3 . and in powers of 10, add -15 and 8, we get -7, isn't it

  13. anonymous
    • one year ago
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    ok

  14. arindameducationusc
    • one year ago
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    now 4.14*3 we get 12.4, now divide it by 2.55.

  15. arindameducationusc
    • one year ago
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    so total we have 4.87 * 10^-7, isn't it? And you have a problem that it is 487, right?

  16. anonymous
    • one year ago
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    ok

  17. anonymous
    • one year ago
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    Nanometer is 10^-9, the answer you got was 10^-7, so just some need to do conversion and you get the numbers.

  18. arindameducationusc
    • one year ago
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    now listen carefully 1nm=10^-9m, right? so,when we have 4.87*10^-7 if we take it to nanometer, 100 is multiplied to 4.87

  19. arindameducationusc
    • one year ago
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    and 100 is divided in 10th power to make it to nanometer.....

  20. arindameducationusc
    • one year ago
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    so, you get 487*10^-9, Got it?

  21. anonymous
    • one year ago
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    is their a single number i can just times by

  22. arindameducationusc
    • one year ago
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    I didn't get you, single number?

  23. anonymous
    • one year ago
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    yea like when we have somthing in grams we just divide by 1000 to get in kg

  24. anonymous
    • one year ago
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    0.000000001

  25. arindameducationusc
    • one year ago
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    yes, yes

  26. arindameducationusc
    • one year ago
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    10^-9 is 0.000000001 10^-7 is 0.0000001

  27. anonymous
    • one year ago
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    in my data shhet i have to h values one in ev and the other in J which one to use?

  28. arindameducationusc
    • one year ago
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    eV

  29. anonymous
    • one year ago
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    how know for sho

  30. arindameducationusc
    • one year ago
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    1eV=1.602*10^-19 J

  31. arindameducationusc
    • one year ago
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    you can convert and write anyone.... its your choice....

  32. anonymous
    • one year ago
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    if the question is in ev then i use ev right

  33. arindameducationusc
    • one year ago
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    yes.. ofcourse

  34. arindameducationusc
    • one year ago
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    But you can use Joules, but it will just become complicated...

  35. arindameducationusc
    • one year ago
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    Got it?

  36. anonymous
    • one year ago
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    yea

  37. anonymous
    • one year ago
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    i hav e anotehr

  38. anonymous
    • one year ago
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    i was doing these practive probs but wasnt getting the right answer doww

  39. anonymous
    • one year ago
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    frequineces required for photoelectron emsiion in 400 THz

  40. arindameducationusc
    • one year ago
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    ya, i will try ask

  41. anonymous
    • one year ago
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    wavelength 500nm what is speed if excaping eletrons ?

  42. anonymous
    • one year ago
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    tell me waht u get for speed

  43. arindameducationusc
    • one year ago
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    from which orbit are the electrons escaping?

  44. anonymous
    • one year ago
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    doesnt say anthing else

  45. anonymous
    • one year ago
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    their was a work funstion 2.65*10^-19

  46. arindameducationusc
    • one year ago
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    ya work function....

  47. arindameducationusc
    • one year ago
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    Wait

  48. arindameducationusc
    • one year ago
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    The minimum energy required to make an electron free from the metal is called the work function, right?

  49. anonymous
    • one year ago
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    ye

  50. arindameducationusc
    • one year ago
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    okay I got it....... use this

  51. arindameducationusc
    • one year ago
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    hc/lambda=workfunction+K.E

  52. arindameducationusc
    • one year ago
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    K.E is kinetic energy

  53. arindameducationusc
    • one year ago
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    and K.E=1/2mv^2

  54. arindameducationusc
    • one year ago
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    so you can get v from here.... rest all data given h,c,lambda,mass of electron and work function

  55. arindameducationusc
    • one year ago
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    just plug in the values... you will get the answer. Got it?

  56. anonymous
    • one year ago
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    Ek=hc/wavelenght

  57. anonymous
    • one year ago
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    i tried i didnt get btw what u get

  58. arindameducationusc
    • one year ago
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    so, do you have the answer with you? I will solve and ask you

  59. anonymous
    • one year ago
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    yes

  60. arindameducationusc
    • one year ago
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    9.33 * 10^21

  61. arindameducationusc
    • one year ago
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    long calculation

  62. anonymous
    • one year ago
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    its 5.40*10^5

  63. arindameducationusc
    • one year ago
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    hmmm

  64. arindameducationusc
    • one year ago
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    but the process is this way.... well I was of no use... sorry... I did my best....

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