EASY
9th Manipur Board
IMPORTANT
Earn 100

Give two practical applications of reflection of sound waves.

Important Questions on Waves and Sound

EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 11
What is loudness of sound? On which factors does it depend?
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 12
Explain the working and application of a SONAR.
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 13
A sound wave travels in a medium at a speed of 340 m/s. If its wavelength is 1.7 cm, what is the frequency? Will it be an audible sound?
MEDIUM
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 14
Explain the working of human ear.
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 15
A source of sound produces 20 crests and 20 troughs in 0.2 s. What is the frequency of the wave in hertz?
EASY
9th Manipur Board
IMPORTANT
Science for Class 9>Chapter 11 - Waves and Sound>EXERCISES>Q 16
The time period of a periodic wave is 0.02 s. At a particular position, there is a crest at t=0. A trough will appear at this position at 't' equal to