Question

If the wave number of a beam of light is 400/cm then find out the frequency

Answer 1

"Wavelength of a beam of light =400 cm-1; 'v = 400 cm-1

v =1 /λ

λ = 1/v = 1/400 cm = 2.5 x 10-3 cm

= 2.5 x 104 nm.

Calculation of frequency

c = vλ

v = c /λ = cv = 3 x 1010 cm s-1 x 400 cm-1

= 1.2 x 1013 s-1

"

Answer 2

Answer:

Explanation:

v =1 /λ

λ = 1/v = 1/400 cm = 2.5 x 10-3 cm

= 2.5 x 104 nm.

Calculation of frequency

c = vλ

v = c /λ = cv = 3 x 1010 cm s-1 x 400 cm-1

= 1.2 x 1013 s-1