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11. Sound eLearn.Punjab
11.3 How can you prove the mechanical nature of sound by a simple experiment?
11.4
11.5 What do you understand by the longitudinal wave? Describe the longitudinal nature of
11.6
11.7 sound waves.
11.8
11.9 Sound is a form of wave. List at least three reasons to support the idea that sound is a
11.10
11.11 wave.
11.12
11.13 We know that waves manifest phenomenon of reflection, refraction and diffraction.
11.14 Does sound also manifest these characteristics?
11.15
11.16 What is the difference between the loudness and intensity of sound? Derive the
11.17
11.18 relationship between the two.
On what factors does the loudness of sound depend?
What do you mean by the term intensity level of the sound? Name and define the unit
of intensity level of sound.
What are the units of loudness? Why do we use logarithmic scale to describe the range
of the sound intensities we hear?
What is the difference between frequency and pitch? Describe their relationship
graphically.
Describe the effect of change in amplitude on loudness and the effect of change in
frequency on pitch of sound.
If the pitch of sound is increased, what are the changes in the following?
a. the frequency b. the wavelength
c. the wave velocity d. the amplitude of the wave
If we clap or speak in front of a building while standing at a particular distance, we
rehear our sound after sometime. Can we explain how this happens?
What is the audible frequency range for human ear? Does this range vary with the age
of people? Explain.
Explain that noise is a nuisance.
Describe the importance of acoustic protection.
What are the uses of ultrasound in medicine?
CONCEPTUAL QUESTIONS
11.1 Why two tin cans with a string stretched between them could be better way to
11.2 communicate than merely shouting through the air?
11.3 We can recognize persons speaking with the same loudness from their voice. How is
this possible?
You can listen to your friend round a corner, but you cannot watch him/her. Why?
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