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What is the difference between echo and reverberation?
Chapter: [7] Sound
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What are the conditions necessary for the formation of echo?
Chapter: [7] Sound
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Give a simple experiment to demonstrate the reflection of sound waves.
Chapter: [7] Sound
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How will you find the velocity of sound waves?
Chapter: [7] Sound
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Explain how the principle of echo is used by
The bat during its flight at
Chapter: [7] Sound
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Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
Chapter: [7] Sound
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Name the waves which are used in sonar to find the depth of sea.
Chapter: [7] Sound
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What is meant by echo? What are the conditions necessary for its formation?
Chapter: [7] Sound
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Why do echoes produced in an empty auditorium usually decrease when it is full of audience?
Chapter: [7] Sound
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Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
Chapter: [7] Sound
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How much work is done when 5 C charge moves across a p.d. of 1 V?
Chapter: [8] Current Electricity
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The device used for measuring potential difference is
Chapter: [8] Current Electricity
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How will you maintain a potential difference between the ends of a conductor?
Chapter: [8] Current Electricity
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A heater is rated at 1200 W when the electric current is 5 A. Calculate the resistance and the potential difference.
Chapter: [8] Current Electricity
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A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
Chapter: [8] Current Electricity
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Define the following:
Potential difference
Chapter: [8] Current Electricity
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