Describe a simple experiment that demonstrates that the sound produced by a tuning fork is due to vibrations of its arms.
Describe in brief, with the aid of a labelled diagram, an experiment to demonstrate that a material medium is necessary for the propagation of sound
Choose the correct word/words to complete the following sentence:
When sound travels in a medium __________ (the particles of the medium, the source, the disturbance, the medium) travels in form of a wave
Describe an experiment to show that in a wave motion, only energy is transferred, but particles of medium do not leave their positions
Draw a displacement-distance graph of a wave and mark on it, the amplitude of the wave by the letter a and wavelength of the wave by the letter λ.
How is the wave velocity V, frequency f, and wavelength λ of a wave related? Derive the relationship
Answer the following:
(i) Can sound travel in a vacuum?
(ii) How does the speed of sound different in different media?
If you place your ear close to an iron railing which is tapped some distance away, you hear the sound twice. Explain why?
The sound of an explosion on the surface of a lake is heard by a boat man 100m away and by a
diver 100m below the point of explosion.
(i) Who would hear the sound first: boat man or diver?
(ii) Give a reason for your answer in part (i)
(iii) If sound takes time t to reach the boat man, how much time approximately does it take
to reach the diver
How do the following factors affect, if at all, the speed of sound in air:
(i) Frequency of air
(ii) Temperature of air
(iii) Pressure of air
(iv) Moisture in air?
Describe a simple experiment to determine the speed of sound in air. What approximation is made in the method described by you?
Complete the following sentences:
(a) Sound cannot travel through _________ but it requires a _____________
(b) When sound travels in a medium, the particles of medium __________ but the disturbance
(c) A longitudinal wave is composed of compression and _____________
(d) A transverse wave is composed of crest and _____________
(e) Wave velocity = ____________ x wavelength
The correct statement is:
(a) Sound and light both require a medium for propagation
(b) Sound can travel in a vacuum, but light cannot
(c) Sound needs a medium, but light does not need a medium for its propagation
(d) Sound and light both can travel in vaccum
Sound in air propagates in form of:
(a) Longitudinal wave
(b) Transverse wave
(c) Both longitudinal and transverse wave
(d) Neither longitudinal nor transverse wave
The separation between two consecutive crests in a transverse wave is 100m. If wave velocity is 20 m s-1, find the frequency of the wave
A longitudinal wave travels at a speed of 0.3 m/s and the frequency of a wave is 20Hz. Find the separation between the two consecutive compressions
An observer A fires a gun and another observer B at a distance 1650m away from A hears its sound. If the speed of sound is 330m/s, find the time when B will hear the sound after firing by A
The time interval between a lightning flash and the first sound of thunder is 5s. If the speed of sound in air is 330 m/s, find the distance of the flash from the observer.
A boy fires a gun and another boy at a distance hears the sound of fire 2.5s after seeing the flash. If the speed of sound in air is 340m/s, find the distance between the boys.
An observer sitting in a line of two tanks watches the flashes of two tanks firing at each other at the same time, but he hears the sounds of two shots 2s and 3.5s after seeing the flashes. If distance between the two tanks is 510m, find the speed of sound
How long will sound take to travel in (a) an iron rail and (b) air, both 3.3km in length? Take speed of sound in air to be 330m/s and in iron to be 5280m/s
(a) An average person can hear sound of frequencies in the range ___________ to
(b) Ultrasound is of frequency ____________
(c) Infrasonic sound is of frequency ___________
(d) Bats can produce and hear ___________ sound
(e) Elephants produce ____________ sound
The properties of ultrasound that make it useful, are:
(a) High power and high school
(b) High power and good directivity
(c) High frequency and high speed
(d) High frequency and bending around the objects
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