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Chapter 8 - Waves - 6
1.
In longitudinal waves particles of the medium vibrate perpendicular to direction of propagation of the wave.
a) True
b) False
2.
A periodic motion is one which repeats itself in equal time intervals.
a) False
b) True
3.
According to Newton's Formula, velocity of sound in air at 0
o
C is 280 ms
-1
.
a) True
b) False
4.
Two coherent waves propagating simultaneously along same line will interfere constructively if the path difference between them is (2n +1)
l
/2
a) True
b) False
5.
Two identical waves propagating in opposite direction along the same line give rise to stationary waves.
a) True
b) False
6.
When a transverse wave is reflected from a denser medium, crest is reflected as trough.
a) True
b) False
7.
The wave length of stationary waves set up on a sting is
l
n
= 2l/2
a) True
b) False
8.
In a closed organ pipe the wavelength of fundamental note is 4 times the length of the organ pipe.
a) True
b) False
9.
Two turning forks have frequencies 256 Hz and 260 Hz respectively. The number of beats per second are 4.
a) False
b) True
10.
When a listener moves away from a sounding source, the pitch of the sound will decrease.
a) True
b) False
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