Chapter 15: Problem 2128
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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An observer is at \(2 \mathrm{~m}\) from an isotropic point source of light emitting \(40 \mathrm{w}\) power. The rm.s value of electric due to the source at the position of the observer is (A) \(5.77 \times 10^{-8} \mathrm{Vm}^{-1}\) (B) \(17.3 \mathrm{Vm}^{-1}\) (C) \(57.7 \times 10^{-8} \mathrm{Vm}^{-1}\) (D) \(1.73 \mathrm{Vm}^{-1}\)
A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum \(p\) and energy \(E\), then (A) \(p=0, E=0\) (B) \(p \neq 0, E \neq 0\) (C) \(p \neq 0, E=0\) (D) \(p=0, E \neq 0\)
Unit of \(\mu_{0} \mathrm{c}\) is same as that of (A) current (B) resistance (C) electric charge (D) velocity
According to Maxwell, a changing electric field produces (A) emf (B) radiation pressure (C) electric current (D) magnetic field
Which of the following electromagnetic waves has the highest frequency? (A) radiowaves (B) microwaves (C) \(\gamma\) rays (D) \(\mathrm{x}\) rays
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