Question

calculate the frequency and the wave number of electromagnetic radiation whose wave length is 800 nm​

Answer 1

Answer:

Explanation:

Given period = 2.0 x 10-10s

We know, Frequency (ν) of light  ,therefore putting the values .we get

We also know  

Where,c = velocity of light in vacuum = 3×108 m/s

Substituting the value in the given expression of λ, we get

Wave number of light

Answer 2

Answer:

(i) The frequency of the light wave is

period

1

=

2.0×10

−10

s

1

=5×10

9

/s.

(ii) The wavelength of light wave is

ν

c

=

5×10

9

/s

3×10

8

m/s

=6.0×10

−2

m.

(iii) The wave number of light wave is

ν

ˉ

=

λ

1

=

6.0×10

−2

1

=16.66/m.

Explanation:

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