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[2 Mark Question Answer]

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Question 12 Marks
Name two source of sound. How sound is produces by human beings?
Answer
The speech box, also known as the larynx, is used by humans to create sound. The voice box is located at the top of the windpipe in our throat. The vocal cords are two ligaments found in the human voice box. The waves of the vocal cords produce sound.
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Question 22 Marks
If you are provided with a powerful cracker, a stop watch, a measuring tape and a friend to help you, explain how can you measure the approximate speed of sound.
Answer
Once you see the flash of explosion of cracker, start the stop watch. Once you hear the sound of explosion of cracker, stop the stop watch. Now you have the time taken by sound to cover 100 m. So the velocity of sound will be simply distance divided by time.
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Question 32 Marks
Describe how the energy is carried to the ear, from the source of sound, through a material medium.
Answer
The vibrations produced by the objects reach until the eardrum through the air. These vibrations produced to make the eardrum vibrate. And then the vibrations are passed to the inner ear through middle ear bones or ossicles.
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Question 42 Marks
What are conditions for the transmission of sound?
Answer
An object that creates vibration by striking it, secondly that body which vibrates on striking and last medium through which sound waves can travel because when an object strikes the vibrating body then vibrations are produced that develops sound waves.
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Question 52 Marks
What causes the sound? Describe an experiment in support of your answer.
Answer
Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. Vibration caused in a tuning fork makes sound and if it is dipped in water, we can see waves which proves that vibrations produce sound.
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[2 Mark Question Answer] - PHYSICS STD 7 Questions - Vidyadip