B. Answer these questions.
1. Explain in brief about some sources of sound.
2. Why is a sound wave called a longitudinal wave?
3. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
Class 7 ICSE
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1. a) Tuning fork— A tuning fork is a fork with two points. If it is beat in a pad, you will hear a drumming sound.
b) String instruments— Instruments like guitar and violin have strings in them. If you pull the strings you will hear a sound.
2. A sound wave is called a longitudinal wave because it is produced by compressions and rarefactions in the air. The air particles vibrate parallel to the direction of propagation.
3. 6000
Hope this helps u. Please mark as brainliest, as I’ve written all the answers myself.☺️
b) String instruments— Instruments like guitar and violin have strings in them. If you pull the strings you will hear a sound.
2. A sound wave is called a longitudinal wave because it is produced by compressions and rarefactions in the air. The air particles vibrate parallel to the direction of propagation.
3. 6000
Hope this helps u. Please mark as brainliest, as I’ve written all the answers myself.☺️
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