Question

What is the frequency of radiation whose wavelength is 2.51 x 10 -7m?​

Answer 1

The frequency of radiation : 1.2 x 10¹⁵ Hz

Further explanation

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

`\large{\boxed{\bold{E\:=\:h\:.\:f}}}`

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

f = c / λ

c = speed of light

= 3.10⁸ m/s

λ = wavelength

Wavelength-λ is 2.51 x 10⁻⁷m

The frequency :

`\tt f=(3.10^8)/(2.51* 10^(-7))=1.2* 10^(15)`