Default Title

Question (1)

QN0038619

Two pulses in a stretched string whose centres are initially apart are moving towards each other as shown in the figure. The speed of each pulse is . After , the total energy of the pulses will be

(A)
Zero
(B)
Purely kinetic
(C)
Purely potential
(D)
Partly kinetic and partly potential

Correct Answer: B

Explanation:

After , the each wave travels a distance . The wave shape is shown in figure.

Thus energy is purely kinetic.

Link:

Report Error

Question (2)

QN0038620

Two sound waves travel in the same direction in a medium. The amplitude of each wave is and the phase difference between the two waves is . The resultant amplitude will be.

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

Here,

The amplitude of the resultant wave is

Link:

Report Error

Question (3)

QN0038621

Two sound sources and emit pure sinusoidal coherent waves in phase. If the speed of sound is , then find out the frequencies for which constructive interference occurs at .

(A)
(B)
(C)
(D)
All of these

Correct Answer: D

Explanation:

Path difference,

For constructive interference,

, where

Link:

Report Error

Question (4)

QN0038622

In a large room, a person teceives direct sound waves from a source away from him. He also receives waves from the same source which reach him, being reflected from the high celling at a point halfway between them. The two waves interfere constructively for wavelength of

(A)
etc
(B)
etc
(C)
etc
(D)
etc

Correct Answer: B

Explanation:

The path difference, .

For constructive interference

For

Ceiling here acts as free boundary, so do not add phase difference due to reflection.

Link:

Report Error

Question (1)

Two pulses in a stretched string whose centres are initially apart are moving towards each other as shown in the figure. The speed of each pulse is . After , the total energy of the pulses will be

Explanation:

Link:

Question (2)

Two sound waves travel in the same direction in a medium. The amplitude of each wave is and the phase difference between the two waves is . The resultant amplitude will be.

Explanation:

Link:

Question (3)

Two sound sources and emit pure sinusoidal coherent waves in phase. If the speed of sound is , then find out the frequencies for which constructive interference occurs at .

Explanation:

Link:

Question (4)

In a large room, a person teceives direct sound waves from a source away from him. He also receives waves from the same source which reach him, being reflected from the high celling at a point halfway between them. The two waves interfere constructively for wavelength of

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY