Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 2>Q 14

EASY

JEE Main

IMPORTANT

Earn 100

The radiation pressure on any surface:

62.5% studentsanswered this correctly

Important Questions on Electromagnetic Waves

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IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 2>Q 15

Find the average intensity of the beam, whose magnetic field of a beam emerging from a filter facing a floodlight as given by,

B = 12 \times 10^{- 8} \sin (1.20 \times 10^{7} z - 3.60 \times 10^{15} t) T

.

EASY

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IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 3>Q 1

Which among the following does not represent Maxwell’s equation?

HARD

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IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 3>Q 2

Consider the following two statements regarding a linearly polarized, plane electromagnetic wave,

$(a)$ The electric field and the magnetic field have equal average values.

$(b)$ The electric energy and magnetic energy have equal average values.

MEDIUM

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IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 3>Q 3

The electric field of an electromagnetic wave travelling through a vacuum is given by the equation

E = E_{0} \sin (k x - ω t)

. The quantity that is independent of wavelength is

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JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 3>Q 4

Correct exposure for a photographic print is

10 s

at a distance of one metre from a point source of

20 cd

. For an equal fogging of the print placed at a distance of

2 m

from a

16 cd

source, the necessary time for exposure is

HARD

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 3>Q 5

The electric field of a plane electromagnetic wave in vacuum is represented by,
$E_{x} = 0, E_{y} = 0.5 \cos [2 π \times 10^{8} (t - \frac{x}{c})]$ and $E_{z} = 0$ . Which option is incorrect?

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IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 3>Q 6

A

160 W

infrared source is radiating light of wavelength

50000 \overset{°}{A}

uniformly in all directions. The photon flux at a distance of

1.8 m

is of the order of,

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 17 - Electromagnetic Waves>Level 3>Q 7

Select the dimensional formula of

\frac{B^{2}}{2 μ_{0}} .