Light with a wavelength of 5.0 · 10-7 m strikes a surface that requires 2.0 ev to eject an electron. Calculate the energy, in joules, of one

Question

Light with a wavelength of 5.0 · 10-7 m strikes a surface that requires 2.0 ev to eject an electron. Calculate the energy, in joules, of one incident photon at this frequency.

_____ joules

4.0 x 10 -19
9.9 x 10 -32
1.1 x 10 -48
4.0 x 10 -49

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Thu Thảo 7 months 2021-07-21T02:03:01+00:00 2 Answers 0 views 0

Answers ( )

  1. thucuc
    0
    2021-07-21T02:04:50+00:00
    Reply

    Answer:

    They are: -14 joules.

    And the other answer is: 9.9 x 10-32.

    Explanation:

    Since to convert to joules it is necessary to add 4 with 9 decimal places to the first number and to the second number 25 decimal places are added.

    — Since 5.0 plus 4 and 9 decimals is: 9.9

    — As 10 – 7 plus 25 decimals: 10 – 32

    — And 9.9 in joules is 8.0 x 10 – 32 = – 22 and 8.0 x -22 is – 14. So they are – 14 joules.

    — And the other answer is: 9.9 x 10- 32

    I hope I have helped.

  2. Tryphena
    0
    2021-07-21T02:04:53+00:00
    Reply

    -14 would be the answer

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )