Question:
What is the audible range?
Sound
Q 1.
Fill in the blanks :
If a body repeats its back and forth, to and fro or up and down motion along a certain path, about a fixed point, in a certain time interval then the motion of such objects is said to be _____________.
Q 2.
Fill in the blanks :
The principle on which stethoscope works is _____ (reflection/ multiple reflection)
Q 3.
What is speed of sound in air?
Q 4.
What type of wave is represented by density- distance graph?
Q 5.
What is Sound? Why it is important for us?
Q 6.
Distinguish between loudness and intensity of sound.
Q 7.
Fill in the blanks :
In the case of ____________ wave, distance between two consecutive crests or troughs is known as wavelength.
Q 9.
What are ultrasonics?
Q 10.
What is the range of frequencies of audio waves,infrasonics and ultrasonics ?
Q 11.
What is reverberation?
Q 12.
Discuss the structure of human ear from auditory aspect only.
Q 13.
Give examples of organisms which can hear infrasonic?
Q 14.
A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?
Q 15.
Calculate the wavelength of a sound wave having a frequency 300 Hz and speed 330 m/s.
Q 16.
A man fires a gun towards a hill and hears its echo after 5 s.He then moves 340 m towards the hill and fires his gun again.This time he hears the echo after 3 s.Calculate the speed of sound.
Q 17.
Guess which has a higher pitch : a guitar or a car horn ?
Q 18.
What are wavelength,frequency,time period and amplitude of a sound wave ?
Q 19.
Cite an experiment to show that sound needs a material medium for its propagation.
Q 20.
The frequency of a source of sound is 100 Hz.How many times does it vibrate in a minute ?
Q 21.
Does sound follow the same laws of reflection as light does ? Explain.
Q 22.
What is loudness of sound ? What factors does it depend on ?
Q 24.
How is sound propagated through a material medium ? What is wave motion ?
Q 25.
Discuss the role of medium in the propagation of sound.
Q 26.
Distinguish between music and noise.
Q 27.
What is an echo ? How is it formed ?
Q 28.
What is SONAR ? How is it used to detect an underwater object and measure its distance
Q 29.
We see flash earlier than the thunder.Discuss.
Q 30.
On what factors does the speed of sound in a material depend ?
Q 31.
Fill in the blanks :
In a __________ wave the particles of the medium oscillate in a direction perpendicular to the direction in which the wave propagates.
Q 32.
Fill in the blanks :
In a _____________ wave the particles of the medium oscillate in the direction in which the wave travels.
Q 33.
Fill in the blanks :
Audible sound range is _________ to _____________.
Q 34.
How does sound travel in gases and liquids as longitudinal or as transverse waves?
Q 35.
What is a longitudinal wave?
Q 36.
Give examples of longitudinal waves.
Q 37.
What type of waves can travel in vacuum? Give example(s).
Q 38.
If 20 waves are produced per second, what is the frequency in hertz?
Q 39.
A longitudinal wave is produced on a slinky.The frequency of the wave is 25 Hz and it travels at a speed of 20 cm/s. Find the separation between consecutive positions of maximum compressions.
Q 40.
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.
Q 41.
A wave of wavelength 0-60 cm is produced in air and it travels at a speed of 300 m/s.Will it be audible ?
Q 42.
A child hears an echo from a cliff 4 s after the sound of a pwerful cracker is produced.How far away is the cliff from the child ? (Take speed of sound in air as 340 m/s)
Q 43.
How does the sound produced by a vibrating object in a medium reach your ear ?
Q 44.
What is the audible range of the average human ear ?
Q 45.
How is ultrasound used for cleaning ?
Q 46.
Explain how defects in a metal block can be detected using ultrasound.
Q 47.
Explain how the human ear works.
Q 48.
Can sound waves travel through vacuum ?
Q 49.
What is audible range ?
Q 50.
Can you produce sound without utilizing energy ?
