If ultraviolet radiation are incidenting over a metal surface. Now it is replaced with X-rays then what happens to kinetic energy of emitted electrons.
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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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Which of the following has the shortest wavelength: Microwaves, Ultraviolet rays, X-rays
X-rays has shortest wavelength.
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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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What is the role of ultraviolet (UV) radiation in the water purification systems?
(a) Ultraviolet radiation inactivates / kills harmful micro organisms in water only.
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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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What is the importance of ozone in the atmosphere? (a) It provides protection against ultraviolet radiation.
(a) It provides protection against ultraviolet radiation.
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Injurious ultraviolet radiations are mostly prevented from reaching the land surface as these are
(a) Injurious ultraviolet radiations are mostly prevented from reaching the land surface as these are mostly absorbed by ozone which are formed in stratosphere.
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What is the purpose of Ozone layer? 1. Protects UV rays to reach on earth 2. Helps UV rays to reach earth
(c) The source of ozone is the oxygen in the atmosphere. Ozone layer protects the living being from the UV radiation which reaches the earth.
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