Waves

Q: The waves of motion set up in any medium depends upon:

(a) :  Elasticity
(b) :  Inertia
(c) :  Denisty
(d) :  All of these
(e) :  None of the Above
Answer:  All of these
Explanation:  

Q: An artificia satellite is receding from the Earth at a speed of 0.2 C where C is speed of light. It emits signals of frequency 4 × 10⁷ Hz The apparent frequency received is

(a) :  3.3 × 10⁷ Hz
(b) :  4 × 10⁷ Hz
(c) :  3 × 10⁸ Hz
(d) :  None of these
(e) :  None of the Above
Answer:  3.3 × 10⁷ Hz
Explanation:  

Q: In a stretched string, the speed of waves is independent of

(a) :  Tension
(b) :  Total mass of string
(c) :  Length of wire
(d) :  The point from where the string is plucked
(e) :  None of the Above
Answer:  The point from where the string is plucked
Explanation:  

Q: The distance coverd by the waves during one period is called its:

(a) :  Wave number
(b) :  Frequency
(c) :  Wave length
(d) :  Time period
(e) :  None of the Above
Answer:  Wave length
Explanation:  

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