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Chapter 8 - Waves - 4
1.
For destructive interference, the path difference between interfering waves is _____________________
a) (2n + 2)
l
/ 2
b) (2n + 1)
l
/ 2
c) (2n + 3)
l
/ 2
d) (2n + 3)
t
/ 2
2.
Number of beats per second is equal to the _________________ between frequencies of the sources.
a) Difference
b) Distance
c) Longitude
d) Amplitude
3.
When a transverse wave is incident on a denser medium from rarer one, it undergoes a phase change of ________ on reflection.
a) 90
o
C
b) 270
o
C
c) 180
o
C
d) 45
o
C
4.
The pitch of the sound __________________ when a source moves towards a stationary observer.
a) Decreases
b) Increases
c) Sharpens
d) Fails
5.
The wave which propagate due to oscillation of electric and magnetic field is called.
a) Crest
b) Its speed in oxygen
c) Electromagnetic waves
d) Crests and troughs
6.
The wave consists of alternately placed
a) (y
1
+ y
2
)
b) Crests and troughs
c) ΔP x V / ΔV
d) Electromagnetic waves
7.
The speed of sound in air at t
o
c is given by
a) ΔP x V / ΔV
b) (y
1
+ y
2
)
c) V
t
= V
o
+ 0.61t
d) 333 ms
-1
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