1
JEE Main 2024 (Online) 27th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

An object is placed in a medium of refractive index 3 . An electromagnetic wave of intensity $$6 \times 10^8 \mathrm{~W} / \mathrm{m}^2$$ falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space $$=3 \times 10^8 \mathrm{~m} / \mathrm{s}$$ ) :

A
$$6 \mathrm{~Nm}^{-2}$$
B
$$36 \mathrm{~Nm}^{-2}$$
C
$$18 \mathrm{~Nm}^{-2}$$
D
$$2 \mathrm{~Nm}^{-2}$$
2
JEE Main 2024 (Online) 27th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A plane electromagnetic wave propagating in $$\mathrm{x}$$-direction is described by

$$E_y=\left(200 \mathrm{Vm}^{-1}\right) \sin \left[1.5 \times 10^7 t-0.05 x\right] \text {; }$$

The intensity of the wave is :

(Use $$\epsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}$$)

A
$$35.4 \mathrm{~Wm}^{-2}$$
B
$$53.1 \mathrm{~Wm}^{-2}$$
C
$$26.6 \mathrm{~Wm}^{-2}$$
D
$$106.2 \mathrm{~Wm}^{-2}$$
3
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Match List I with List II of Electromagnetic waves with corresponding wavelength range :

List I List II
(A) Microwave (I) $400 \mathrm{~nm}$ to $1 \mathrm{~nm}$
(B) Ultraviolet (II) $1 \mathrm{~nm}$ to $10^{-3} \mathrm{~nm}$
(C) X-Ray (III) $1 \mathrm{~mm}$ to $700 \mathrm{~nm}$
(D) Infra-red (IV) $0.1 \mathrm{~m}$ to $1 \mathrm{~mm}$

Choose the correct answer from the options given below:
A
(A)-(I), (B)-(IV), (C)-(II), (D)-(III)
B
(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
C
(A)-(IV), (B)-(I), (C)-(III), (D) -(II)
D
(A)-(IV), (B)-(II), (C)-(I), (D)-(III)
4
JEE Main 2023 (Online) 13th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In an electromagnetic wave, at an instant and at particular position, the electric field is along the negative $$z$$-axis and magnetic field is along the positive $$x$$-axis. Then the direction of propagation of electromagnetic wave is:

A
at $$45^{\circ}$$ angle from positive y-axis
B
positive $$y$$-axis
C
negative $$\mathrm{y}$$-axis
D
positive z-axis
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