Question

yellow light emmited from a sodium lamp has wave length of 580nm .calculate the frequency and wave no.of yellow light

Answer 1

Answer:

Wavelength,

λ = 580 nm

= 580 x 10-9 m

Velocity of light,

C = 3 x 108 ms-1

Frequency,

v = C/λ

= {3 x 108 ms-1}/{580 x 10-9 m}

= 5.17 x 1014 s-1

= 5.17 x 1014 Hz

or

s-1

Wave number,

bar v

= 1/λ

= {1}/{580 x 10-9 m}

= 1.72 x 106 m-1