Physics Crash Course NEET>Chapter 16 - Electromagnetic Waves>Level 3>Q 14

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The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is

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Important Questions on Electromagnetic Waves

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Physics Crash Course NEET>Chapter 16 - Electromagnetic Waves>Level 3>Q 15

If

v_{g}, v_{X}

and

v_{m}

are the wave speeds of gamma rays,

X -

rays and microwaves respectively in vacuum, then

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Physics Crash Course NEET>Chapter 16 - Electromagnetic Waves>Level 3>Q 16

An electromagnetic wave is travelling in

x

-direction with electric field vector given by,

{\vec{E}}_{y} = E_{0} \sin (k x - ω t) \hat{j}

. The correct expression for magnetic field vector is

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Physics Crash Course NEET>Chapter 16 - Electromagnetic Waves>Level 3>Q 17

Which of the following pairs of space and time-varying

E

and

B

fields would generate a plane electromagnetic wave travelling in the

(- z)

direction?

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Physics Crash Course NEET>Chapter 16 - Electromagnetic Waves>Level 3>Q 18

Consider the following
(i) Submarine communications
(ii) A.M. radio
(iii) Shortwave ratio
(iv) Radar

Arrange the above in increasing frequency of the waves associated with them

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Physics Crash Course NEET>Chapter 16 - Electromagnetic Waves>Level 3>Q 19

The magnetic field amplitude of an electromagnetic wave is

2 \times 10^{- 7} T

. Its electric field amplitude if the wave is travelling in free space is

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Physics Crash Course NEET>Chapter 16 - Electromagnetic Waves>Level 3>Q 20

A book can be read if it is placed at a distance of 50 cm from a source of 1 cd. At what distance should the book placed if the source is of 16 cd?