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AP and TS EAMCET Engineering 2020 Model Paper 1
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© examsnet.com
Question : 108
Total: 160
A photo sensitive metallic surface emits electrons when X-rays of wavelength
′
λ
′
fall on it. The de Broglie wavelength of the emitted electrons is (Neglect the work function of the surface, m is mass of the electron. h-Planck's constant c- velocity of light)
√
2
m
c
h
λ
√
h
λ
2
m
c
√
m
c
h
λ
√
h
λ
m
c
Validate
Solution:
λ
1
=
h
p
and
E
=
p
2
2
m
⇒
p
=
√
2
m
E
∴
p
=
√
2
m
×
h
c
λ
⇒
λ
1
=
h
√
2
m
h
c
λ
∴
λ
1
=
√
h
λ
2
m
c
© examsnet.com
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