Explain, why lightening is visible earlier than thunder?
Why sound produced due to sudden explosions going on in the sun cannot be heard on the earth? What was the Laplace's correction to the Newton's formula for the speed of sound in the air? Write the basic principle for the working of radar system?
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An explosion occurs at a distance of 5km from a soldier. How long after the explosion does the soldier hear it? (Assume
of air is 20°C)
Why stars moving toward earth show a blue shift and those moving away show red shift? Why radar cannot detect under water objects?
Two waves of slightly different frequency moving in the same direction along the same line produce beats. How beats
are generated?
What is effect of pressure on the speed of sound in a gas?
Why the product of frequency and wavelength always remain constant? is speed of wave depends upon the number of loops?
To which factor the velocity of sound depends upon?
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23 Write answers of any EIGHT questions.
How the ultrasonic waves are useful in communication?
What do you understand by superposition?
(8 x 2 = 16)
How the dolphin detects small difference in structure of objects? What happen when a jet plane like Concorde flies faster than speed of sound?
Show that V-A is dimensionally correct.
why a gas cannot transmit a transverse wave? if the relative velocity between the source and the listener is zero, is there any effect observed in the pitch
frequency) of note by the listener? What is period of a 250 cycles per second of a sound waves?
Does interference of two waves involve a loss of energy? Explain.
It has been claimed that a certain singer could shatter a glass goblet by singing a particular note, Is it possible?
What are the conditions for the constructive and destructive interference?
How the speed of the transverse wave in a string will change if its tension is made four times.
(6 x 2 = 12)
Write answers of any SIX questions.
Explain the difference between transverse and longitudinal waves.
How should a sound source move with respect to an observer so that the frequency of its sound does not
change?
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Explain the term red shift and blue shift? Why sound waves travel faster in solids than in gases?
Explain, why energy remain standing in medium between nodes
is it possible for two identical waves traveling in the same direction along a string to
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give rise to a stationary
wave?
Why does the speed of sound in a gas changes with temperature? A wave is produced along a stretched string but some of its particle permanently show zero displacement. What
Type of wave is it?
What is phase difference between two points, which are (e) One wavelength apart (b) one half of wavelength
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