Question

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 ____

Answer 1

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.

Answer 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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