Which of the following has the shortest wavelength: Microwaves, Ultraviolet rays, X-rays
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What causes chromatic aberration? (a) Marginal rays (b) Central rays
(d) The cause of chromatic aberration is that lens focusses different colours at different points.
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Arrange the following in descending order of wavelength: X-rays, Radio waves, Blue light, Infrared light
Radiowaves, Infrared light, Blue light, X-rays.
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How are microwaves produced? Write their two important uses.
Microwaves are produced by special vacuum tubes, namely; klystrons, magnetrons and gunn diodes. Their frequency range is 3 GHz to 300 Ghz. They are used in radar systems used in...
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Name the physical quantity which remains same for microwaves of wavelength 1mm and UV radiations of 1600Å in vacuum.
Velocity (c = 3×108m/s) This is because both are electromagnetic waves.
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Arrange EMR in increasing order of their wave length. Microwave , X-rays , Radio Waves & UV rays
X-rays < UV rays < Micro wave < Radio
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Cobalt-60 is commonly used in radiation therapy because it emits (a) alpha rays (b) beta rays
(c) Cobalt-60 is useful as a gamma ray source because it can be produced in predictable quantity and high activity by bombarding cobalt with neutrons. This is commonly used in...
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Which one of the following types of glass can cut off ultraviolet rays?
(d) Crookes glass is a type of glass that contains cerium and other rare earths and has a high absorption of ultraviolet radiation used in sunglasses.
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If ultraviolet radiation are incidenting over a metal surface. Now it is replaced with X-rays
As energy of X-ray photons is greater than UV. So KE increases.
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Perpendicular rays are usually more heating than oblique rays. Therefore, south-facing slopes are warmer
(a) in the northern hemisphere
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Mr X has been invited to participate in a conference to be held at Buenos Aires. He has choosen the following shortest flight route
(d) Mr X will likely to be flown over Black Sea. Since Black Sea is bounded by Europe, Anatolia and Caucasus, it is ultimately connected to the Atlantic Ocean.
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