Electrons are emitted with zero velocity from a metal surface when light of wavelength 6000 A0 is incident on the metal. The work function of the metal is ____
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Answered by
2
Answer:
Since, K.E is zero, the energy of radiation is equal to the work function of the metal. Also, the threshold frequency is equal to the frequency of radiation.
The threshold frequency is
ν
o
=ν=
λ
c
=
6800×10
−10
3.0×10
8
m/s
m
=4.41×10
14
/s.
The work function is
hν
0
=6.626×10
−34
×4.41×10
14
=2.92×10
−19
J.
Answered by
2
Answer:
Velocity is zero ∴ K.E. = 0
Eincident = work function
⇒6.6×10−27×3×1010cm/sec6000×10−8cm
=29.15×10−13ergs
Explanation:
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