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State how vectors $\vec{E}$, $\vec{B}$ and $\vec{c}$ are oriented in an electromagnetic wave.
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Electromagnetic Waves - ISC Class 12 Physics Questions with Answers, Page 2
34 past-paper questions on Electromagnetic Waves from ISC Class 12 Physics papers (2027-2018), newest first, in full. Questions 21-34 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Name the electromagnetic wave / radiation which is used to study crystal structure.
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used for viewing through haze and fog.
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Radio waves and gamma waves are both transverse in nature and electromagnetic in character and have the same speed in vacuum. In what respects are they different?
- (a)Frequency
- (b)wavelength
- (c)Both, (a) and (b)
- (d)None of these
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Which electromagnetic radiation has wavelength greater than that of X-rays and smaller than that of visible light?
- (a)Radio waves
- (b)Microwaves
- (c)Infra Red Rays
- (d)Ultra Violet Rays
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Which of the following groups belongs only to the electromagnetic spectrum?
- (a)alpha rays, beta rays, gamma rays
- (b)ultra-sonic rays, radio waves, infra red rays
- (c)gamma rays, cathode rays, X-rays
- (d)X-rays, radio waves, infra red rays
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Which is the most harmful radiation entering the atmosphere of earth from outer space?
- (a)X - Rays
- (b)Visible rays
- (c)Gamma radiations
- (d)Radio waves
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State any one use of infrared radiations.
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State any one source of ultraviolet radiations.
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State any two properties of microwaves.
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Name an electromagnetic wave which is used in the radar system used in aircraft navigation.
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Which electromagnetic radiation is used to study the crystal structure?
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What is the ratio of the speed of gamma rays to that of radio waves in vacuum?
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What is displacement current?
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