Chapter 15: Problem 2208
If the earth were not having atmosphere, its temperature (A) would have been low (B) would have been high (C) would have remain constant (D) none of these
Chapter 15: Problem 2208
If the earth were not having atmosphere, its temperature (A) would have been low (B) would have been high (C) would have remain constant (D) none of these
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Get started for freeThe waves used in communication are generally called (A) \(\gamma\) rays (B) \(\alpha\) rays (C) microwaves (D) radiowaves
Electromagnetic waves are produced by (A) a static charge (B) a moving charge (C) an accelerating charge (D) chargeless particles
Infrared radiations are detected by (A) spectrometer (B) bolometer (C) photocells (D) geiger tubes
The frequency \(1057 \mathrm{MHz}\) of radiation arising from two close energy levels in hydrogen belongs to (A) radio waves (B) infrared waves (C) micro waves (D) \gamma rays
The rms value of the electric field of the light coming from the sun is $720 \mathrm{~N} / \mathrm{c}$. The average total energy density of the electromagnetic wave is (A) \(4.58 \times 10^{-6} \mathrm{Jm}^{-3}\) (B) \(6.3 \times 10^{-9} \mathrm{Jm}^{-3}\) (C) \(81.35 \times 10^{-12} \mathrm{Jm}^{-3}\) (D) \(3.3 \times 10^{-3} \mathrm{Jm}^{-3}\)
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