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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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The amplitude of the magnetic field part of an electromagnetic wave in vacuum is \(\mathrm{Bm}=510 \mathrm{nT}\). Then the amplitude of the electric part of the wave is (A) \(1.53 \times 10^{11} \mathrm{~V} / \mathrm{m}\) (B) \(1.53 \mathrm{~V} / \mathrm{m}\) (C) \(1.53 \times 10^{2} \mathrm{~V} / \mathrm{m}\) (D) \(1.53 \times 10^{8} \mathrm{~V} / \mathrm{m}\)
What is the wave length of range of electromagnetic waves? (A) \(10^{-8} \mathrm{~m}\) to \(10^{15} \mathrm{~m}\) (B) \(10^{-15} \mathrm{~m}\) to \(10^{8} \mathrm{~m}\) (C) \(10^{-15} \mathrm{~m}\) to \(10^{15} \mathrm{~m}\) (D) \(10^{8} \mathrm{~m}\) to \(10^{15} \mathrm{~m}\)
Electromagnetic waves used in medicine to destroy cancer cells (A) radio waves (B) infrared rays (C) gamma rays (D) ultraviolet rays
According to Maxwell, a changing electric field produces (A) emf (B) Electric current (C) magnetic field (D) radiation pressure
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) \(\overline{\mathrm{M}^{1} \mathrm{~L}^{0} \mathrm{~T}^{-3}}\)
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