Name: Sources of Electromagnetic Waves
Uploaded: 2019-07-19
Duration: 5 min 12 s
Description: Can you name some sources of electromagnetic waves by looking around you? You will learn about the different sources of electromagnetic waves

Question

Write the relation between energy and frequency of radiation.

Accepted Answer

The relationship, E = hf concerns the energy of an individual photon, not the energy of a classical electromagnetic wave. The energy carried by a classical wave is proportional to intensity, or in effect the number of photons, as well as to the frequency of the photons.

Since the number of photons in an electromagnetic wave is essentially a free variable, this means that there is no effective relationship between energy and frequency for an electromagnetic wave. If more energy is put into producing a wave at given frequency, the number of photons in the wave will increase.

In the particular case that the electromagnetic wave is produced by temperature, there is a relationship between frequency and temperature. As temperature increases, so too does the peak frequency of radiation. This applies to the “black body” component of the radiation, produced by random emissions.

Write the relation between energy and frequency of radiation.

Important Questions on Electromagnetic Waves

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