Physics
Grade-8
Easy
Question
Which of the below is used to amplify sound?
- Earphone
- Megaphone
- Drums
- Empty box
Hint:
Megaphone
The correct answer is: Megaphone
- Megaphone is a funnel-shaped instrument.
- It is used to amplify a person's voice or other sounds and direct it in a particular direction.
- So, the correct option is b.
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Units to measure sound:
- The unit of power is watt.
- The unit of force is newton.
- The unit of work is Joule.
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- The unit of power is watt.
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SONAR is used in _______
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A sonar can detect the enemy ship using
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Music is heard from a vehicle's horn.
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Sound from a speaker undergoes an echo to reach the source back from a mountain located at a distance of 340 m from the source. The total time taken by the sound to cover this distance is 2 s. The speed of sound is ___ m/s.
After echo, the total distance travelled = 2d
Sound from a speaker undergoes an echo to reach the source back from a mountain located at a distance of 340 m from the source. The total time taken by the sound to cover this distance is 2 s. The speed of sound is ___ m/s.
PhysicsGrade-8
After echo, the total distance travelled = 2d
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Decreasing amplitude of a sound wave decreases the _______.
Decreasing amplitude of a sound wave decreases the _______.
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Cinema theatres are designed for the sound to _______.
Cinema theatres are designed for the sound to _______.
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To make a sound louder, the sound should be _______.
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If a sound travels a distance of 100 m in 2 s, its velocity is ____ m/s.
If a sound travels a distance of 100 m in 2 s, its velocity is ____ m/s.
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The horn of a vehicle is based on ___________ of sound.
- A megaphone works on the principle of multiple reflections of sound.
The horn of a vehicle is based on ___________ of sound.
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- A megaphone works on the principle of multiple reflections of sound.
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Sonar has receiver __________.
Sonar has receiver __________.
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Drums can produce ultrasound.
Drums can produce ultrasound.
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