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Chapter 15: Problem 2163
The SI unit of displacement current is (A) coulomb (B) henry (C) ampere (D) faraday
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The frequency of an electromagnetic wave in free space 15 \(3 \mathrm{MHz}\). When it passes through a medium of relative permeability \(\varepsilon_{\mathrm{r}}=4.0\), then its frequency (A) becomes half (B) become doubled (C) remain same (D) become \(\sqrt{2}\) times
Dimensional formula of intensity of radiation is (A) \(\mathrm{M}^{1} \mathrm{~L}^{2} \mathrm{~T}^{-2}\) (B) \(\mathrm{M}^{1} \mathrm{~L}^{0} \mathrm{~T}^{-2}\) (C) \(\mathrm{M}^{1} \mathrm{~L}^{2} \mathrm{~T}^{-3}\) (D) \(\overline{\mathrm{M}^{1} \mathrm{~L}^{0} \mathrm{~T}^{-3}}\)
Which of the following electromagnetic waves is used in telecommunication? (A) radiowaves (B) visible radiations (C) ultraviolet rays (D) microwaves
The sun delivers \(10^{3} \mathrm{Wm}^{-2}\) of electromagnetic flux to earth's surface. The total power that is incident on a roof of dimension $8 \mathrm{~m} \times 20 \mathrm{~m}$ will be (A) \(4 \times 10^{5} \mathrm{w}\) (B) \(2.56 \times 10^{4} \mathrm{w}\) (C) \(6.4 \times 10^{5} \mathrm{w}\) (D) \(1.6 \times 10^{5} \mathrm{w}\)
Which of the following electromagnetic waves has the longest wavelength? (A) Radio waves (B) Infrared radiations (C) x rays (D) visible rays
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