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A radiowave has a maximum magnetic field induction of $10^{- 4}$ T on arrival at a receiving antenna. The maximum electric field intensity of such a wave is

zero

$3 \times 10^{4} V / m$

$5.8 \times 10^{- 9} V / m$

$3.3 \times 10^{13} V / m$

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Explanation

$A s w e k n o w, E_{0} = c B_{0} = 3 \times 10^{4} V / m$

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A capacitor is having a capacity of 2 pF. The electric field across the capacitor is changing with a value of $10^{12}$ V/s. The displacement current is :

2 A

3 A

6 A

9 A

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Explanation

$(1) I_{D} = C \frac{dV}{dt} = 2 \times 10^{- 12} \times 10^{12} = 2 A$

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The shortest wavelength is for

$γ$ -rays

X-rays

ultraviolet rays

microwaves

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Explanation

$γ$ -rays have the shortest wavelength.

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An accelerated charge :

emits an electromagnetic wave

does not emit electromagnetic wave

produces a gravitational field

None of these

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Explanation

An accelerated charge produces an electric field as well as a magnetic field.

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The electromagnetic radiations are in descending order of wavelength in the following sequences :

infra-red waves, radio waves, X-rays, visible light rays

Radio-waves, infra-red waves, visible light rays, X-rays

Radio waves, visible light rays, infra-red waves, X-rays

X-rays, visible light rays, infra-red wave, radio-waves

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Explanation

The correct order is; radio-waves, infra-red waves, visible light rays, X-rays.

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X-rays and $γ$ -rays are both electromagnetic waves, which one of the following statements is true?

in general, X-rays have a larger wavelength than that of $γ$ -rays

X-rays have a smaller wavelength than that of $γ$ -rays

$γ$ -rays have smaller frequency than that of X-rays

wavelength and frequency of X-rays are both larger than those of $γ$ -rays.

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Explanation

In general, X-rays have a larger wavelength than that of $γ$ -rays.

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Which of the following are not electromagnetic waves?

cosmic rays

gamma rays

$β$ -rays

X-rays

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Explanation

$β$ -rays are beam are fast-moving electrons.

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The frequencies of X-rays, $γ$ -rays and ultraviolet rays are respectively a, b and c. Then :

a < b, b < c

a > b, b > c

a > b, b > a

a < b, b > c

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Explanation

$Frequency of γ - rays is more than both the frequencies of X - rays and ultrav i olet rays .$

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A plane electromagnetic wave of frequency 40 MHz travels in free space in the x-direction. At some point and at some instant, the electric field $\vec{E}$ has its maximum value of 750 N/C in y-direction. The wavelength of the wave is

3.5 m

5.5 m

7.5 m

9.5 m

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Explanation

$λ = \frac{C}{v} = \frac{3 \times 10^{8}}{40 \times 10^{6}} = 7.5 m$

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The waves used in telecommunication are

infrared

visible light

microwaves

ultraviolet rays

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Explanation

The waves that are used in communication are radio waves, microwaves, infrared radiation, and light. But in telecommunication microwaves are used.

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