Question

can someone explain how we use frequency and wavelength to discover the radiation pls with examples as well thank you and when we know what formula we are supposed to use.

Answer 1

Each part of electromagnetic spectrum can be characterised by its frequency and wavelength.

Electromagnetic spectrum has its components from radiowaves to gamma rays.

Light has a dual nature, wave nature and particle nature. The wave nature of light is responsible for its frequency and wavelength.

The light can travel as a wave at its microlevel. When the light is travelling as wave, crests and troughs form. The distance between two successive crests or troughs in the wave form is called its wavelength.

Radiowaves have wavelength ranging from 1 m to 100 m

Visible spectrum have wavelength of 400-700 nm

Likewise, all radiations can be characterised by its wavelength.

Frequency is the number of waves that can pass through unit distance in second. Depending on its wavelength radiations have their frequency.

If the wavelength is higher then the number of waves that can pass through a unit distance in time will decrease. All radiations have a common speed that is the speed of light.

From, the energy of radiation we can calculate its frequency.

We have the relation

E = h

Where, E = Energy of radiation

h = Planck's constant

= Frequency of radiation.

From the frequency of radiation, we can calculate the wavelength.

We have the relation

= C /

Where = wavelength of radiation

C = Speed of light

= frequency of radiation.

This means the radiation with a certain wavelength has its characteristic frequency and energy. Thus from the wavelength of the radiation, we can calculate the frequency and energy of the radiation.