Modern Physics 2 Question 23
22. When photons of energy strike the surface of a metal , the ejected photoelectrons have maximum kinetic energy expressed in and de-Broglie wavelength . The maximum kinetic energy of photoelectrons liberated from another metal by photons of energy is . If the de-Broglie wavelength of these photoelectrons is , then
(a) the work function of
(b) the work function of
(c)
(d)
Show Answer
Solution:
Therefore,
From Eqs. (i) and (ii),
de-Broglie wavelength is given by
This gives,
From Eq. (i)
From Eq. (iii)
or