Chapter 15: Problem 2207
was the first to predict the existence of electromagnetic waves. (A) Maxwell (B) Faraday (C) Ampere (D) hertz
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The dimensional formula of energy density is (A) \(\mathrm{M}^{1} \mathrm{~L}^{0} \mathrm{~T}^{-2}\) (B) \(\mathrm{M}^{1} \mathrm{~L}^{-1} \mathrm{~T}^{-2}\) (C) \(\mathrm{M}^{1} \mathrm{~L}^{-1} \mathrm{~T}^{-3}\) (D) \(\mathrm{M}^{\mathrm{l}} \mathrm{L}^{0} \mathrm{~T}^{-3}\)
The waves used in communication are generally called (A) \(\gamma\) rays (B) \(\alpha\) rays (C) microwaves (D) radiowaves
Maxwells equations are derived from the laws of (A) electricity (B) magnetism (C) both electricity and magnetism (D) mechanics
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) \(\overline{\mathrm{M}^{1} \mathrm{~L}^{0} \mathrm{~T}^{-3}}\)
If the electric field associated with a radiation of frequency $10 \mathrm{MH} z\( is \)\mathrm{E}=10 \sin (\mathrm{kx}-\omega \mathrm{t}) \mathrm{mV} / \mathrm{m}$ then its energy density is $\mathrm{Jm}^{-3}\left(\varepsilon_{0}=8.85 \times 10^{-12} \mathrm{C}^{2} \mathrm{~N}^{-1} \mathrm{~m}^{-2}\right)$ (A) \(4.425 \times 10^{-10}\) (B) \(6.26 \times 10^{-14}\) (C) \(8.85 \times 10^{-16}\) (D) \(8.85 \times 10^{-14}\)
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