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What is the correct answer?
4
Frequency of the wave having wave number
20000
c
m
-
1
is
A.
6
×
10
12
s
e
c
-
1
B.
6
×
10
14
s
e
c
-
1
C.
3
×
10
14
M
H
z
D.
4
×
10
6
H
z
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