Audible, infrasonic and ultrasonic sounds - class-IX
Description: audible, infrasonic and ultrasonic sounds | |
Number of Questions: 28 | |
Created by: Blackmamba | |
Tags: sound: production of sound sound study of sound physics acoustics |
Which waves are used in sonography?
A microwave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)
Which one of the following animals can hear infrasound?
Some animals get disturbed and start running here and there just before the earthquakes occur because they can hear______________?
The frequency of a wave is $5\;Hz$. Then the wave is a/an (type of wave)
Sounds having frequency more than 20,000 Hz are called -
Which of the following frequency of sound can be heard by a dog but not by a man?
Why do we not hear the screams of a bat
Three different vibrating bodies produce three types of sounds X, Y and Z. Sounds X and Y cannot be heared by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in for monitoring nuclear reactor.The sound similar to that which is produced during an earthquake before the main shock wave is generated. What type of sounds are (i) X (ii) Y, and (iii) Z?
Elephants communicate with
Which one has higher frequency?
The property of ultrasonic waves used in manufacturing emulsion for photographic films is its, _____________
The grandparents and parents of two-year old girl are playing with her in a room. A sound source produces a $28 kHz$ sound. Who in the room is most likely to hear the sound?
The audible range in humans is ____________.
Ultrasonic waves.
The range of the wavelength of audible sound that travels with a velocity of 330 m s$^{-1}$ at 0$^{\circ}$ C is 16.5 m - 16.5 mm.
The sound intensity is 0.008 $W/m^2$ at a distance of 10 m from an isotropic point source of power of the source is approximately :
A train running at 108 km/hr towards east whistles at a frequency of 800 Hz. The frequencies heard by a passenger sitting in the train and a person standing near the track whom the train has just passed (Speed of Sound = 330 m/s)
The driver of a car travelling at the speed of $30m/sec$ towards a hill sounds a horn of frequency $600\ Hz$. If the velocity of sound in air is $330m/s$, the frequency of reflected sound as heard by the driver is
Ultrasonic, intrasonic and audible waves travel through a medium with speeds $V _u,V _i,$ and $V _a$ respectively, then (given constant temperature)
A man fires a gun and hears the echo after $2\,\frac{1}{2}sec$. If the velocity of sound in air is $340ms^{-1}$ his distance from the cliff causing the echo is
A sound wave of pressure amplitude $5$ pascal propagates through the air medium. The normal pressure of air is $1.0\times10^5 N/m^2$. The difference between maximum and minimum pressure in the medium is
A siren emitting a sound of frequency $1000 Hz$ moves away from you towards a cliff at a speed of $10 m/s$ [speed of sound in air $330 m/s$] Then.
A person moving in a car with a velocity of $36kmph $ towards a fort wall blows a horn. If he hears the echo after $3s$, the distance of the wall from him. when he blows then horn (velocity of sound $340ms^P{-1}$)
Bats detect the obstacles in their path by receiving the reflected
Echocardiography is used to diagnose heart diseases which utilises infrasonic waves.
The frequency of a wave is 5 Hz. It refers to (type of wave) ___________.
Sound of frequency below $20 \ Hz$ is called