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Standard XII
Physics
Question
The threshold frequency of potassium is
3
×
10
14
H
z
. Its work function is-
1.0
×
10
−
19
J
2
×
10
−
19
J
4
×
10
−
19
J
0.5
×
10
−
19
J
A
2
×
10
−
19
J
B
4
×
10
−
19
J
C
0.5
×
10
−
19
J
D
1.0
×
10
−
19
J
Open in App
Solution
Verified by Toppr
Work function will be
ϕ
=
h
ν
0
=
6.62
×
10
−
34
J
s
×
3
×
10
14
H
z
=
19.86
×
10
−
20
J
which is nearly
2
×
10
−
19
J
Option B is correct.
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2
Similar Questions
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Threshold wavelength for photoelectric effect on sodium is 5000
∘
A
. Its work function is
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Q2
A metal has a work function of
2
.
5
×
10
−
19
J
.
The threshold frequency beyond which photo electrons will come out is
.