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Chapter 15: Problem 2198
Infrared radiations are detected by (A) spectrometer (B) bolometer (C) photocells (D) geiger tubes
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Which of the following electromagnetic waves is used in telecommunication? (A) radiowaves (B) visible radiations (C) ultraviolet rays (D) microwaves
An electromagnetic wave going through vacuum is described by $E=E_{0} \sin (k x-\cot )$. Which of the following is independent of the wavelength? (A) \(\omega\) (B) \((\mathrm{k} / \mathrm{c})\) (C) \(\mathrm{k}_{\mathfrak{e}}\) (D) \(\mathrm{k}\)
Electromagnetic waves travelling in a medium which has relative permeability \(1.3\) and relative permittivity \(2.14\) speed of electromagnetic waves in this medium will be (A) \(3.6 \times 10^{8} \mathrm{~m} / \mathrm{s}\) (B) \(1.8 \times 10^{8} \mathrm{~m} / \mathrm{s}\) (C) \(1.8 \times 10^{6} \mathrm{~m} / \mathrm{s}\) (D) \(13.6 \times 10^{6} \mathrm{~m} / \mathrm{s}\)
The velocity of light in vacuum can be changed by changing (A) frequency (B) wavelength (C) amplitude (D) none of these
What is the wavelength range of visible light? (A) \(10 \mathrm{~A}\) to \(100 \mathrm{~A}\) (B) \(4000 \mathrm{~A}\) to \(7000 \mathrm{~A}\) (C) \(8000 \AA\) to \(10000 \AA\) (D) \(10000 \AA\) to \(15000 \AA\)
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