EASY
9th CBSE
IMPORTANT
Earn 100

Why is sound wave called a longitudinal wave?

Important Questions on Sound

EASY
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 5
Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
EASY
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 6
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 7
A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s–1.
HARD
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 8
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child. Take the speed of sound wave in aluminium and in air at, 25℃ as  6420 m s-1, 346 m s-1 respectively.
EASY
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 9
The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
EASY
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 10
Does sound follow the same laws of reflection as light does? Explain.
MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 11
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
MEDIUM
9th CBSE
IMPORTANT
SCIENCE TEXTBOOK FOR CLASS IX>Chapter 12 - Sound>Exercises>Q 12
Give two practical applications of reflection of sound waves.