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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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Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
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How are bats able to fly in the dark?
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What do you understand by the ‘Echolocation system of Dolphins’?
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State two factors on which the natural frequency of a body depends.
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A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
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A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.
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Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
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When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?
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Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
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Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
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