1
COMEDK 2024 Evening Shift
+1
-0

Column - I lists the waves of the electromagnetic spectrum. Column - II gives approximate frequency range of these waves. Match Column - I and Column - II and choose the correct match from the given choices.

Column I Column II
(A) Radiowaves (P) $$10^{18} \text { to } 10^{20} \mathrm{~Hz}$$
(B) Microwaves (P) $$10^{11} \text { to } 5 \times 10^{14} \mathrm{~Hz}$$
(C) Infrared (R) $$10^4 \text { to } 10^8 \mathrm{~Hz}$$
(D) X-rays (S) $$10^9 \text { to } 10^{12} \mathrm{~Hz}$$

A
(A)-(R) (B)-(P) (C)-(S) (D)-(Q)
B
(A)-(R) (B)-(S) (C)-(Q) (D)-(P)
C
(A)-(R) (B)-(S) (C)-(P) (D)-(Q)
D
(A)-(R) (B)-(Q) (C)-(S) (D)-(P)
2
COMEDK 2023 Morning Shift
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The ratio of amplitude of magnetic field to the amplitude of electric field of an electromagnetic wave propagating in vacuum is

A
reciprocal of speed of light in vacuum
B
the speed of light in vacuum
C
proportional to frequency of the electromagnetic wave
D
inversely proportional to the frequency of the electromagnetic wave
3
COMEDK 2023 Morning Shift
+1
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A plane electromagnetic wave of frequency $$20 \mathrm{~MHz}$$ travels through a space along $$x$$-direction. If the electric field vector at a certain point in space is $$6 \mathrm{~Vm}^{-1}$$, then what is the magnetic field vector at that point?

A
$$2 \times 10^{-8} \mathrm{~T}$$
B
$$\frac{1}{2} \times 10^{-8} \mathrm{~T}$$
C
$$2 \mathrm{~T}$$
D
$$\frac{1}{2} \mathrm{~T}$$
4
COMEDK 2023 Evening Shift
+1
-0

What feature of the infrared waves make it useful for the haze photography?

A
Since it is invisible
B
Since it has large wave length
C
Since it is absorbed by the medium
D
Since it has high frequency
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