Photoelectrons with a maximum speed of 8.00 * 107 m/s are ejected from a surface in the presence of light with a frequency of 7.50 * 1014Hz. If the mass of an electron is 9.10 * 10-31 kg, calculate the maximum kinetic energy of a single electron, in joules.

7.28 * 10-23 J

5.82 * 10-15 J

2.91 * 10-15 J

3.41 * 10-16 J

Question

9 January, 18:28

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Evangeline Lambert · Answer 1

KE = 1/2 * mass * velocity^2

KE = 1/2 * 9.10x10^-31 * (8.00x10^7) ^2

KE = 1/2 * 9.10x10^-13 * 6.4x10^15

KE = 2.912x10^-15 J or C