EASY
9th CBSE
IMPORTANT
Earn 100

A human heart beats 75 times a minute. Calculate its frequency.

Important Questions on Sound

EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E
Sound travels with a speed of 330 m/s. What is the wavelength of sound whose frequency is 660 Hz?
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E
Calculate the frequency of the pendulum of a wall-clock, if its time period is 0.2 s.
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E

A sound of a certain frequency is travelling at speed of 330 m/s in a given medium. Calculate the frequency, if its wavelength is 3 m.

EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E
50 waves pass through a point in 0.1 second. If the distance between one crest and the adjacent trough is 0.34 m, calculate the frequency,
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E
50 waves pass through a point in 0.1 second. If the distance between one crest and the adjacent trough is 0.34 m, calculate the wavelength.
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E
50 waves pass through a point in 0.1 second. If the distance between one crest and the adjacent trough is 0.34 m, calculate its wave velocity.
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E
A child hears an echo from a cliff 4 seconds after the sound from a powerful cracker is produced. How far away is the cliff from the child? (take velocity of the sound in air as 330 m/s)
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 6 - Sound>Exercises>Q E
The distance between a crest and a trough is 20 cm in ripples on the surface of water. When 20 ripples are produced in one second, calculate the time period.