Home
Class 9
PHYSICS
Wavelength of ultrasonic waves in air is...

Wavelength of ultrasonic waves in air is of the order of :

A

`5 xx 10^-3 m`

B

`5 xx 10^5 m`

C

`5 xx 10^4 m`

D

`5 xx 10^6 m`

Text Solution

Verified by Experts

The correct Answer is:
A
Frequency of ultrasound waves are greater than `20 kHz` and as such their wavelength in air `(i.e., lamda = (v)/(v) = (344 m//s)/(20 xx 10^3) = 17.2 xx 10^(-3) m)` is smaller than `17.2 xx 10^-3 m`.
Promotional Banner

Topper's Solved these Questions

  • SOUND

    PRADEEP|Exercise (Exemplar) Multiple Choice|9 Videos

  • SOUND

    PRADEEP|Exercise (Assessment) Multiple choice|20 Videos

  • SOUND

    PRADEEP|Exercise (6 a) Formative (Pen Test)|15 Videos

  • MOTION

    PRADEEP|Exercise Mock test|24 Videos

  • WORK AND ENERGY

    PRADEEP|Exercise III Quiz Testing|10 Videos

Similar Questions

Explore conceptually related problems

The wavelength of infrasonics in air is of the order of

The wavelength of an ultrasonic wave is :

A hospital uses an ultrasonic scanner of frequency 3.2 MHz to locate the tumours in a tissue. The wavelength of ultrasonic waves in tissue in which the speed of the wave is 1.6 km/s is

What are ultrasonic waves ?

Ultrasonic waves of frequency 3 x 105 Hz are passed through a medium where speed of sound is 10 times that in air (Speed of sound in air is 300 m/s). The wavelength of this wave in that medium will be of the order of

Ultrasonic waves of frequency 4.5 MHz are used to detect tumour in soft tissues. The speed of sound in tissue is 1.5 km s^-1 and that in air is 340 m s^-1 . Find the wavelength of this ultrasonic wave in air and in tissue.

What will be the change in the wavelength of a sound wave in air if its frequency is doubled?

Sound waves travel from air to water. The velocity of the sound waves in air is 332 ms^(-1) and wavelength is 2m. If the wavelength of the sound waves in water is 850 cm, find its velocity in water