Question

ASSESMENT
Type: Multiple Choice Type
n No. 12
The wave number of a radiation having a
wavelength of 250nm is
1) 2.5 x 10-7 m-1
2) 1.2 x 1017m-1
3) 4 x 106 m
4) 75 m​

Answer 1

Answer:

1 number is correct answer

Answer 2

Answer:

1)2.5 × 10-7 m-1

Explanation:

wavelength = 250 nm = 250×10^-9

wave number = 1/Lambda or reciprocal of wave length

so 1÷ 250×10^-9

= 2.5×10^-7 m-1