Physics For Class 9>Chapter 5 - Sound>Exercise>Q 6

MEDIUM

9th CBSE

IMPORTANT

Earn 100

A sound wave has a frequency of $2 kHz$ and wavelength $35 cm$ . How long will it take to travel $1.5 km$ ?

Important Questions on Sound

EASY

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 7

A tuning fork having frequency $256 Hz$ emits a wave which has a wavelength of $1.35 m$ . Calculate the speed of sound in air.

EASY

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 8

A periodic longitudinal wave is sent on a slinky. The wave proceeds at a speed of

48 m / s

and each particle oscillates at a frequency of

12 Hz

. Calculate the minimum separation between the positions where the slinky is most compressed.

EASY

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 9

How far does sound travel in air when a tuning fork of frequency

560 Hz

makes

30

vibrations? Take speed of sound in air

= 336 m / s

.

EASY

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 10

Chandigarh radio station broadcasts at

1200 KHz

. At what metre Chandigarh station would be tuned in your transistor? Take speed of the wave,

v = 3 \times 10^{8} {ms}^{- 1}

EASY

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 11

Radio Ceylon broadcasts at

25 m

. What is the frequency of the station? Take speed of light,

v = 3 \times 10^{8} {ms}^{- 1}

.

EASY

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 12

A wave of wavelength

0.60 cm

is produced in air and it travels at a speed of

300 {ms}^{- 1}

. Will it be audible? Take speed of the wave,

v = 300 {ms}^{- 1}

.

EASY

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 13

A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in a tissue in which the speed of sound is

1.7 km / s

? The operating frequency of the scanner is

4.2 MHz

.

MEDIUM

9th CBSE

IMPORTANT

Physics For Class 9>Chapter 5 - Sound>Exercise>Q 14

A sound is producing

1500

sound waves in

3

seconds. If the distance covered by a compression and an adjacent rarefaction be

68 cm

, calculate:
(i) frequency (ii) wavelength (iii) velocity of the sound wave