1.If the ratio of amplitude of wave is 2 : 1, then the
ratio of maximum and minimum intensity is
a) 9 : 1
b) 1 : 9
c) 4 : 1
d) 1 : 4
Explanation:
2. The two interfering waves have intensities in the
ratio 9 : 4. The ratio of intensities of maxima and
minima in the interference pattern will be
a) 1 : 25
b) 25 : 1
c) 9 : 4
d) 4 : 9
Explanation:
3.If the ratio of amplitude of two waves is 4 : 3.
Then the ratio of maximum and minimum
intensity will be
a) 16 : 18
b) 18 : 16
c) 49 : 1
d) 1 : 49
Explanation:
4. Two waves having the intensities in the ratio of 9
: 1 produce interference. The ratio of maximum to
the minimum intensity, is equal to
a) 2 : 1
b) 4 : 1
c) 9 : 1
d) 10 : 8
Explanation:
5.The displacement of the interfering light waves
are \[y_{1}=4\sin \omega t,y_{2}=3\sin \left(\omega t+\frac{\pi}{2}\right)\]
What is the
amplitude of the resultant wave
a) 5
b) 7
c) 1
d) 0
Explanation:
6. Two waves are represented by \[y_{1}=a\sin \left(\omega t +\frac{\pi}{6}\right),y_{2}=a\cos \omega t\] . What will be their resultant
amplitude
a) a
b) \[\sqrt{2}a\]
c) \[\sqrt{3}a\]
d) 2a
Explanation:
7.The amplitude of a wave represented by
displacement equation \[y=\frac{1}{\sqrt{a}}\sin \omega t\pm \frac{1}{\sqrt{b}}\cos \omega t\]
will be
a) \[\frac{a+b}{ab}\]
b) \[\frac{\sqrt{a}+\sqrt{b}}{ab}\]
c) \[\frac{\sqrt{a}\pm\sqrt{b}}{ab}\]
d) \[\sqrt{\frac{a+b}{ab}}\]
Explanation:
8.Two waves having equations
\[x_{1}= a\sin\left(\omega t+\phi_{1}\right),x_{2}= a\sin\left(\omega t+\phi_{2}\right)\]
If in the resultant wave the frequency and
amplitude remain equal to those of superimposing
waves. Then phase difference between them is
a) \[\frac{\pi}{6}\]
b) \[\frac{2\pi}{3}\]
c) \[\frac{\pi}{4}\]
d) \[\frac{\pi}{3}\]
Explanation: Superposition of waves does not alter the frequency of resultant wave and resultant amplitude
9.Two tuning forks when sounded together
produced 4 beats/sec. The frequency of one fork is
256. The number of beats heard increases when
the fork of frequency 256 is loaded with wax. The
frequency of the other fork is
a) 504
b) 520
c) 260
d) 252
Explanation:
10.Beats are the result of
a) Diffraction
b) Destructive interference
c) Constructive and destructive interference
d) Superposition of two waves of nearly equal
frequency
Explanation: Superposition of two waves of nearly equal frequency