Question:
What type of wave is represented by density- distance graph?
Answer:
Longitudinal waves.
Sound
Q 1.
Fill in the blanks :
v = ? × ?
Q 2.
What are the factors speed of sound wave depends upon?
Q 3.
Why do we use upholstered seats in theatres and halls ?
Q 4.
What propagates along with the waves ?
Q 5.
Explain how sound is produced by your school bell ?
Q 6.
Explain how the human ear works.
Q 7.
Obtain a relation between speed,frequency and wavelength of a wave.
Q 8.
How does sound travel in gases and liquids as longitudinal or as transverse waves?
Q 9.
What is a wave number?
Q 10.
Calculate the wavelength of a sound wave having a frequency 300 Hz and speed 330 m/s.
Q 11.
How is sound propagated through a material medium ? What is wave motion ?
Q 12.
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 13.
What are ultrasonics?
Q 14.
Radio Ceylon broadcasts at 25 m.What is the frequency of the station ?
Q 15.
Try to imagine what you would feel, what sort of person you would be,had you been born totally deaf.
Q 16.
Fill in the blanks :
Waves transport _________ not matter.
Q 17.
What is reverberation ? How can it be reduced ?
Q 18.
The sound of distant horses can be heard by applying the ear to the ground whereas it is inaudible if the ear is held a little distance above the ground.Explain.
Q 19.
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 20.
Distinguish between loudness and intensity of sound.
Q 21.
Write the name of the wave which propagates in terms of compressions and rarefactions.
Q 22.
Can you produce sound without utilizing energy ?
Q 23.
What travels faster : a rifle bullet or the sound of the shot fired from it ?
Q 24.
Sounds we hear inform us of the state of world around us,especially of that part of it which our other senses,such as touch and sight,cannot reach.Illustrate this with appropriate examples.
Q 25.
Fill in the blanks :
RADAR (Radio Detection And Ranging) works on _____________ principle which is used to determine the velocities and movement of aircrafts.
Q 26.
Fill in the blanks :
Audible sound range is _________ to _____________.
Q 27.
Can sound wave travel in vacuum?
Q 28.
What type of waves can travel in vacuum? Give example(s).
Q 29.
What is the audible range?
Q 30.
What are wavelength, frequency, time period and amplitude of a sound wave?
Q 31.
What is infrasonic? Give an example.
Q 32.
What type of wave is represented by density- distance graph?
Q 33.
A bat emits ultrasonic sound of frequency 100 kHz in air.If this sound meets a water surface,what is the wavelength of (a) the reflected sound wave (b) the transmitted sound wave ?
Given speed of sound in air = 340 m/s and in water = 1486 m/s.
Q 34.
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 35.
How does the sound produced by a vibrating object in a medium reach your ear ?
Q 36.
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
Q 37.
What is the audible range of the average human ear ?
Q 38.
Does sound follow the same laws of reflection as light does ? Explain.
Q 39.
Explain the working and application of a sonar.
Q 40.
Explain how defects in a metal block can be detected using ultrasound.
Q 41.
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 42.
Can sound waves travel through vacuum ?
Q 43.
What are infrasonics ?
Q 44.
How can you make a building sound proof ?
Q 45.
Discuss the role of medium in the propagation of sound.
Q 46.
How are compressions and rarefactions produced near a source of sound ?
Q 47.
Distinguish between music and noise.
Q 48.
Today our life is richer and fuller of music than it was yesterday,and much of this is due to progress in engineering.What will happen to human feelings when the sea of knowledge spreads further ?
Q 49.
Fill in the blanks :
In a _____________ wave the particles of the medium oscillate in the direction in which the wave travels.
Q 50.
Fill in the blanks :
Sound, compressional waves in springs are examples of _____________.
