Question:
What is audible range ?
Answer:
Sound waves having frequencies between 20 Hz to 20 kHz form the audible range.
Sound
Q 1.
What is speed of sound in air?
Q 2.
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 3.
What is reverberation?
Q 5.
Fill in the blanks :
The principle on which stethoscope works is _____ (reflection/ multiple reflection)
Q 6.
Distinguish between loudness and intensity of sound.
Q 7.
What type of wave is represented by density- distance graph?
Q 8.
What is Sound? Why it is important for us?
Q 9.
What are wavelength, frequency, time period and amplitude of a sound wave?
Q 10.
What are ultrasonics?
Q 11.
Fill in the blanks :
A ________ (pulse/wave) is a disturbance which is sudden and lasts for a short duration of time.
Q 12.
Fill in the blanks :
In the case of ____________ wave, distance between two consecutive crests or troughs is known as wavelength.
Q 13.
What is infrasonic? Give an example.
Q 14.
Fill in the blanks :
RADAR (Radio Detection And Ranging) works on _____________ principle which is used to determine the velocities and movement of aircrafts.
Q 15.
Fill in the blanks :
Loudness of sound is measured in ___________.
Q 16.
What is a mechanical wave?
Q 17.
What is the audible range?
Q 18.
Fill in the blanks :
Sound having frequency less than 20Hz is known as ___________.
Q 19.
Radio Ceylon broadcasts at 25 m.What is the frequency of the station ?
Q 20.
Draw a curve showing density or pressure variations with respect to distance for a disturbance produced by sound.Mark the position of compression and rarefaction on this curve.Also define wavelengths and time period using this curve.
Q 21.
What are the factors speed of sound wave depends upon?
Q 22.
What are transverse waves ?
Q 23.
An engine is approaching a hill at constant speed.When it is at a distance of 0.9 km,it blows a whisde,whose echo is heard by the driver after 5 s.If the speed of sound is 340 m/s,calculate the speed of the engine.
Q 24.
How does the sound produced by a vibrating object in a medium reach your ear ?
Q 25.
Distinguish between loudness and intensity of sound.
Q 26.
How is sound propagated through a material medium ? What is wave motion ?
Q 27.
What do you mean by reverberation and reverberation time ? How is reverberation controlled ?
Q 28.
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 29.
Fill in the blanks :
Full form of SONAR is __________________________.
Q 30.
Can sound wave travel in vacuum?
Q 31.
A sound wave travels at a speed of 339 ms
–1. If its wavelength is 1.5 cm, what is the frequency of the wave?
Q 32.
Give an application use of ultrasonics.
Q 33.
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 34.
What is sound and how is it produced ?
Q 35.
is sound wave called a longitudinal wave ?
Q 36.
What is sound barrier ?
Q 37.
By how much does the speed of sound increase with rise of temperature ?
Q 38.
There are no echoes produced in small living rooms.Explain why echoes are produced only in large galleries and halls.
Q 39.
How can you make a building sound proof ?
Q 40.
What are the characteristics of a sound ? Discuss each one of them briefly.
Q 41.
What is SONAR ? How is it used to detect an underwater object and measure its distance
Q 42.
Fill in the blanks :
When we hear music, the medium through which the sound transmitted is __________ (solid, liquid, gas)
Q 43.
Fill in the blanks :
A ________ (pulse/wave) is a form of disturbance which travels through a medium as a result of repetitive oscillations of the particles of the medium.
Q 44.
Fill in the blanks :
Waves which require a material medium for propagation are called _____________ waves. Example of such waves is _________. Light waves are ___________, because they can travel in vacuum.
Q 45.
Fill in the blanks :
Waves transport _________ not matter.
Q 46.
Fill in the blanks :
In the case of a ___________ wave, distance between two consecutive condensations or rarefactions is known as wavelength.
Q 47.
Fill in the blanks :
Audible sound range is _________ to _____________.
Q 48.
Fill in the blanks :
If the time interval between original sound and reflected sound is more than 1/10 second then original sound and reflected sound can be heard clearly. This reflected sound is known as _______.
Q 49.
Fill in the blanks :
v = ? × ?
Q 50.
How does sound travel in gases and liquids as longitudinal or as transverse waves?