JEE Main 2022 (Online) 27th June Morning Shift | Electromagnetic Waves Question 71 | Physics

1

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

+4

-1

Match List-I with List-II :

	List - I		List - II
(a)	Ultraviolet rays	(i)	Study crystal structure
(b)	Microwaves	(ii)	Greenhouse effect
(c)	Infrared rays	(iii)	Sterilizing surgical instrument
(d)	X-rays	(iv)	Radar system

Choose the correct answer from the options given below :

A

(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

B

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

C

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

D

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

2

JEE Main 2022 (Online) 26th June Evening Shift

MCQ (Single Correct Answer)

+4

-1

Which is the correct ascending order of wavelengths?

A

$$\lambda$$_visible < $$\lambda$$_X-ray < $$\lambda$$_gamma-ray < $$\lambda$$_microwave

B

$$\lambda$$_gamma-ray < $$\lambda$$_X-ray < $$\lambda$$_visible < $$\lambda$$_microwave

C

$$\lambda$$_X-ray < $$\lambda$$_gamma-ray < $$\lambda$$_visible < $$\lambda$$_microwave

D

$$\lambda$$_microwave < $$\lambda$$_visible < $$\lambda$$_gamma-ray < $$\lambda$$_X-ray

3

JEE Main 2022 (Online) 26th June Morning Shift

MCQ (Single Correct Answer)

+4

-1

If Electric field intensity of a uniform plane electromagnetic wave is given as $$E = - 301.6\sin (kz - \omega t){\widehat a_x} + 452.4\sin (kz - \omega t){\widehat a_y}{V \over m}$$. Then magnetic intensity 'H' of this wave in Am^$$-$$1 will be :

[Given : Speed of light in vacuum $$c = 3 \times {10^8}$$ ms^$$-$$1, Permeability of vacuum $${\mu _0} = 4\pi \times {10^{ - 7}}$$ NA^$$-$$2]

A

$$ + 0.8\sin (kz - \omega t){\widehat a_y} + 0.8\sin (kz - \omega t){\widehat a_x}$$

B

$$ + 1.0 \times {10^{ - 6}}\sin (kz - \omega t){\widehat a_y} + 1.5 \times {10^{ - 6}}(kz - \omega t){\widehat a_x}$$

C

$$ - 0.8\sin (kz - \omega t){\widehat a_y} - 1.2\sin (kz - \omega t){\widehat a_x}$$

D

$$ - 1.0 \times {10^{ - 6}}\sin (kz - \omega t){\widehat a_y} - 1.5 \times {10^{ - 6}}\sin (kz - \omega t){\widehat a_x}$$

4

JEE Main 2022 (Online) 26th June Morning Shift

MCQ (Single Correct Answer)

+4

-1

In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size $${\lambda \over {100}}$$, where $$\lambda$$ is the wavelength of the wave in free space. The phenomenon, which happens there will be :

A

Reflection

B

Refraction

C

Diffraction

D

Scattering