Question:
Fill in the blanks :
In the case of ____________ wave, distance between two consecutive crests or troughs is known as wavelength.
Sound
Q 1.
What are the factors speed of sound wave depends upon?
Q 2.
Fill in the blanks :
v = ? × ?
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.
What is a wave number?
Q 7.
Explain how the human ear works.
Q 8.
Obtain a relation between speed,frequency and wavelength of a wave.
Q 9.
Calculate the wavelength of a sound wave having a frequency 300 Hz and speed 330 m/s.
Q 10.
How does sound travel in gases and liquids as longitudinal or as transverse waves?
Q 11.
Radio Ceylon broadcasts at 25 m.What is the frequency of the station ?
Q 12.
How is sound propagated through a material medium ? What is wave motion ?
Q 13.
What are ultrasonics?
Q 14.
What is reverberation ? How can it be reduced ?
Q 15.
Try to imagine what you would feel, what sort of person you would be,had you been born totally deaf.
Q 16.
Can sound wave travel in vacuum?
Q 17.
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 18.
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 19.
Distinguish between loudness and intensity of sound.
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.
Write the name of the wave which propagates in terms of compressions and rarefactions.
Q 22.
Can sound waves travel through vacuum ?
Q 23.
Fill in the blanks :
In a _____________ wave the particles of the medium oscillate in the direction in which the wave travels.
Q 24.
Fill in the blanks :
Loudness of sound is measured in ___________.
Q 25.
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
Q 26.
Explain how defects in a metal block can be detected using ultrasound.
Q 27.
What are infrasonics ?
Q 28.
Can you produce sound without utilizing energy ?
Q 29.
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 30.
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 31.
Fill in the blanks :
Audible sound range is _________ to _____________.
Q 32.
What type of waves can travel in vacuum? Give example(s).
Q 33.
What are wavelength, frequency, time period and amplitude of a sound wave?
Q 34.
What type of wave is represented by density- distance graph?
Q 35.
What is the audible range of the average human ear ?
Q 36.
Explain how bats use ultrasound to catch a prey.
Q 37.
Discuss the role of medium in the propagation of sound.
Q 38.
Describe an experiment to show that sound waves can be reflected.What are the laws of reflection of sound waves.
Q 39.
What is the range of frequencies of audio waves,infrasonics and ultrasonics ?
Q 40.
What are the characteristics of a sound ? Discuss each one of them briefly.
Q 41.
What are multiple echoes ? Discuss any two of their important practical applications.
Q 42.
What travels faster : a rifle bullet or the sound of the shot fired from it ?
Q 43.
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 44.
Fill in the blanks :
Waves transport _________ not matter.
Q 45.
Fill in the blanks :
Sound having frequency less than 20Hz is known as ___________.
Q 46.
Fill in the blanks :
The distance between two consecutive compressions or two consecutive rarefactions is called the ______________.
Q 47.
Why sound waves are called mechanical waves?
Q 48.
Three persons, A, B and C are made to hear a sound travelling through different mediums as given below:
| Persons | Medium |
| A | Iron Rod |
| B | Air |
| C | Water |
Who will hear the sound first? Why?
Q 49.
What is the audible range?
