Question:

2. Consider a metal exposed to light of wavelength 600 nm. The maximum energy of the electron doubles when light of wavelength 4

2. Consider a metal exposed to light of wavelength 600 nm. The maximum energy of
the electron doubles when light of wavelength 400 nm is used. Find the work
function in ev.
Ans: Let the maximum energies of emitted electrons are Ky and K2
when 600 nm and 400 nm visible light are used according to question
K2 = 2K
hc
Kmax = hy - 0 =
2
hc
K=
22
= 2K
K. -
her - - - 2 - 4) - Film - 2
4-[3 ]
hc
22
o =
hc
-
21
2hc
-
21
2
1
0 = hc
(::. hc = 1240 ev nm)
22
6.2
Work function o =
6
= 1.03 eV.

2. Consider a metal exposed to light of wavelength 600 nm. The maximum energy of the electron doubles when light of wavelength 400 nm is used. Find the work function in ev. Ans: Let the maximum energies of emitted electrons are Ky and K2 when 600 nm and 400 nm visible light are used according to question K2 = 2K hc Kmax = hy - 0 = 2 hc K= 22 = 2K K. - her - - - 2 - 4) - Film - 2 4-[3 ] hc 22 o = hc - 21 2hc - 21 2 1 0 = hc (::. hc = 1240 ev nm) 22 6.2 Work function o = 6 = 1.03 eV.

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