Electromagnetic Spectrum: Overview, Questions, Preparation

Here are a few essential terms related to this topic that the candidates need to study thoroughly in order to clear their fundamental concepts:

1. Wavelength:

This is the distance between two peaks of a wave.

SI Unit - meters

Denoted by the symbol λ.

2. Frequency:

This is the number of wave cycles per second.

SI Unit - Hz

Denoted by the symbol ν.

3. Energy:

The formula for energy is E=hν

Where, h = 6.63 × 10⁻³⁴ Js (Planck’s Constant)

4. Amplitude:

This is referred to the maximum strength of the electric or magnetic field in a wave. In simple terms, the peak of the wave is called amplitude.

Mentioned below are the commonly recognized categories of electromagnetic waves in the EM spectrum arranged as per their increasing order of wavelength and frequency:

 

This spectrum has numerous daily life applications and plays a very huge role in human existence. Some core applications of the EM spectrum are as follows:

• Radio Signals and Mobile Phones
• Bluetooth and Wifi
• Microscopes and Telescopes
• Microwaves and Heaters
• Sterilization
• Cameras and Projectors
• TV screens
• Satellites