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State two properties of ultra-violet radiations which differ from visible light.
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State two uses of ultraviolet radiation.
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What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.
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Distinguish between an impure spectrum and a pure spectrum.
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Write the range of wavelength of the visible spectrum.
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Write the range of wavelength of the ultraviolet spectrum.
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Write the range of wavelength of the infrared spectrum.
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Suggest one way, in each case, by which we can detect the presence of Infrared radiations.
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Sunlight entering through a narrow aperture falls on a prism. Draw a neat labelled ray diagram to show the formation of the spectrum on a screen. Name the colour obtained nearer the base of the prism.
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In the figure, a beam of light consisting of three colours blue, red, and yellow is incident on a prism and on a rectangular glass block respectively. Complete the diagram by drawings of the refracted and emergent rays.
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In the figure, a beam of light consisting of three colours blue, red, and yellow is incident on a prism and on a rectangular glass block respectively. Complete the diagram by drawings of the refracted and emergent rays.
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In the diagram, a narrow beam of white light is incident on a right-angled isosceles prism. The critical angle of the material of prism for the yellow colour of white light is 45°. Complete the diagram to show the path of blue, yellow, and red colours of white light till they emerge out of the prism.
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Define the term Frequency (as applied to sound waves)
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Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.
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Write the approximate value of the speed of sound in air.
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Write the approximate value of the speed of sound in water.
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Write the approximate value of the speed of sound in iron.
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Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
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What is meant by echo depth sounding?
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