Question

IDENTIFY THE PART OF ELECTROMAGNETIC SPECTRUM USED IN (1) RADAR (2) EYE SURGERY. WHAT THEIR FREQUENCY RANGE?
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Answer 1

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(i) Radar: Microwaves are used in radar systems. Microwaves are electromagnetic waves of frequency range 1 GHz to 300 GHz or 3 × 1011 to 1 × 109 Hz. (ii) Eye surgery: Ultraviolet rays are used in eye surgery. Ultraviolet rays are electromagnetic waves of frequency range 8 × 1014 to 5 × 1017 Hz.

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Answer 2

Answer:

(a) (i) Radar: Microwaves are used in radar systems. Microwaves are electromagnetic waves of frequency range 1 GHz to 300 GHz or 3 × 1011 to 1 × 109 Hz. (ii) Eye surgery: Ultraviolet rays are used in eye surgery. Ultraviolet rays are electromagnetic waves of frequency range 8 × 1014 to 5 × 1017 Hz. (b) Energy density of electric field is where ε0 is permittivity of free space, E is the electric field, and energy density in magnetic field is where μ0 is the permeability of free space and B is the magnetic field. We know that E = cB, where c is speed of light: C = 1/ √μ0ε0.Therefore, Substituting in Eq. (1), we get Using Eq. (2), we have UE = UB Thus, the average energy density of the oscillating electric field is equal to that of the oscillating magnetic field.Read more on Sarthaks.com - https://www.sarthaks.com/544920/identify-part-electromagnetic-spectrum-used-radar-surgery-write-their-frequency-range