Choose the correct options for the following questions.
Which one of the following wave motions is longitudinal:
Difficulty: Easy
A:
One end of a string is fixed and the other is wiggled
B:
A piece of stone is thrown into still water
C:
Pulling of weight hanging vertically with a spinal spring
D:
Both a and c
Sound waves cannot propagate through:
Difficulty: Easy
A:
Walls
B:
Grass
C:
Wood
D:
Vacuum
Experimental value of speed of sound in air at $0^{\circ}$C is:
Difficulty: Easy
A:
280 m/sec
B:
320 m/sec
C:
332 m/sec
D:
340 m/sec
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