Please select a subject first
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Comment on the statement: ‘When any ray of white light is incident on a glass prism, it simply disperses it into its seven constituent colours.
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What is sound? What causes it to produce?
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Arrange the speeds of sound in gases, solids, and liquids in ascending order.
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The speed of sound is more in hydrogen than in nitrogen. Is this statement true? Give a reason for your answer.
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What is musical sound? Give an example.
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A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
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An observer X is on an island 5500 m from a vertical cliff on the shore. A ship Y is anchored between the island and the Cliff. A blast on the ship’s siren is heard twice by X, the interval being 5s. [Velocity of sound = 330 ms−1]
(i) Find the distance of the ship from the island.
(i) Find the distance of the cliff from the ship.
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Name the particles that constitute the cathode rays. State some properties of cathode rays.
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A nucleus \[\ce{^194_82X}\] emits an alpha particle
- What will be the atomic number of the daughter nucleus Y?
- What will be the number of neutrons in the daughter nucleus Y?
- Write a nuclear reaction showing the emission of this particle.
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Name the waves used for sound ranging. State one reason for their use.
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Work done by this force at any instant is ______.
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Two sound waves X and Y have the same amplitude and the same wave pattern but their frequencies are 60 Hz and 120 Hz respectively, then ______.
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State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
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State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
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Which colour of white light travels slowest, in glass?
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Write the approximate wavelength for red light.
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The wavelengths for the light of red and blue colours are nearly 7·8 × 10-7 m and 4·8 × 10-7 m respectively.
Which colour has greater speed in glass?
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