E M WAVES
Quiz by SUNITHA PRAJITH
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- Q1
Which radiations are used in treatment of muscle ache?
Ultraviolet
Infrared
Microwave
X-rays
30s - Q2
Waves in decreasing order of their wavelength are
X-rays, infrared rays, visible rays, radio waves
radio waves, infrared rays, visible rays, X-rays.
radio waves, ultraviolet rays, visible rays, X-rays.
radio waves, visible rays, infrared rays, X-rays.
60s - Q3
The electric field associated with an e.m wave in vacuum is given by 𝐸⃗ =40 cos (kz – 6 × 108t) 𝑖⃗ , where E, Z and t are in volt/m, metre and seconds respectively. The value of wave vector W is
4 × 108
5 × 108
6 × 108
7 × 108
60s - Q4
From Maxwell’s hypothesis, a charging electric field gives rise to
an induced emf.
a magnetic dipole.
a magnetic field.
an electric field.
30s - Q5
The ultra high frequency band of radio waves in electromagnetic wave is used as in
cellular phone communication
commercial FM radio
both (a) and (c)
television waves
30s