Amplitude Variation

Q.

What are the properties of interference?

Q.

Two waves of same frequency and intensity superimpose with each other in opposite phases, then after superposition the

[AFMC 1995]

1. Intensity increases by 4 times

2. Intensity increases by two times

3. None of these

4. Frequency increases by 4 times

Q.

A wave disturbance in a medium is described by y(x , t)= 0.02 cos (50 $\pi$ t + $\frac{\pi }{2}$) cos (10 $\pi$x) where x and y are in metre and t in second

1. A displacement node occurs at x = 0.5 m

2. An antinode occurs at x = 0.3 m

3. The wavelength of the wave is 0.1m

4. The speed of the wave is 50.0 m/s

Q.

A wave disturbance in a medium is described by y(x , t)= 0.02 cos (50 $\pi$ t + $\frac{\pi }{2}$) cos (10 $\pi$x) where x and y are in metre and t in second

1. The wavelength of the wave is 0.1m

2. The speed of the wave is 50.0 m/s

3. An antinode occurs at x = 0.3 m

4. A displacement node occurs at x = 0.5 m

Q. 12. A source is moving down watds with a velocity of V/5 &observer 1 is helx fixed & another observer who is in liquid moving upwards with an velocity of V/5 the velocity of waves in the liquid is 4V then find the apparent frequency & wavelength according to observer 1 &another observer ? ( V is the velocity of sound waves )(neglect the gravitational acceleration )

Q.

A wave disturbance in a medium is described by y(x , t)= 0.02 cos (50 $\pi$ t + $\frac{\pi }{2}$) cos (10 $\pi$x) where x and y are in metre and t in second

1. A displacement node occurs at x = 0.5 m

2. An antinode occurs at x = 0.3 m

3. The wavelength of the wave is 0.1m

4. The speed of the wave is 50.0 m/s