EASY
9th Manipur Board
IMPORTANT
Earn 100

Explain the formation of compressions and rarefactions in air near a source of sound.

Important Questions on Waves and Sound

EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 3
Define wavelength, periodic time and frequency of a wave.
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 4
Derive the relation between wavelength, frequency and velocity of a periodic wave.
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 5
When you call your friend by name, do you produce a wave pulse of sound or a periodic wave?
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 6
Show graphically how density of air varies with distance when a periodic sound wave travels in it. Show the graph for two instants of time differing by half of periodic time.
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 7
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 8
Does sound follow the same laws of reflection as light does? Explain.
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 9
Describe an experiment to show that sound needs a medium to propagate.
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 10
Give two practical applications of reflection of sound waves.