The fundamental frequency of an open organ pipe is 200 Hz. If one end of the pipe is closed, its fundamental frequency becomes:
1. | 100 Hz | 2. | 200 Hz |
3. | 50 Hz | 4. | 400 Hz |
When height increases, the velocity of sound decreases:
1. | due to the decrease in pressure. |
2. | due to a decrease in temperature. |
3. | as a result of a decrease in both temperature and pressure |
4. | statement is wrong. |
A sufficiently long-closed organ pipe has a small hole at its bottom. Initially, the pipe is empty. Water is poured into the pipe at a constant rate. The fundamental frequency of the air column in the pipe:
1. | Constantly increases |
2. | Increases at first, then becomes constant. |
3. | Constantly decreases |
4. | Decreases at first, then becomes constant. |
Which one of the following graphs represents correctly the given wave equation at the origin?
1. | 2. | ||
3. | 4. |
\(y-x\) graph of a travelling wave along \(+x\) direction is shown at any instant \(t\). (Symbols have their usual meanings). The velocity of a particle at:
1. | \(x_1\) is downward |
2. | \(x_2\) is downward |
3. | \(x_3\) is upward |
4. | \(x_4\) is downward |
Stationary waves can be obtained in an air column even if interfering waves have different:
1. Amplitude
2. Wavelength
3. Velocity
4. Frequency
A sound wave is passed through a chamber. If the r.m.s. speed of molecules in a gas is v1 and the speed of sound is v2 in the gas, then:
1. | v1 = v2 | 2. | v1 > v2 |
3. | v1 < v2 | 4. | v1 ≤ v2 |
A string of length l is fixed at one end and free at the other. If it resonates in different modes, then the ratio of frequencies is:
1. 1:2:3: ......
2. 1:3:5:7: ......
3. 1:2:4:8: ..........
4. 1:3:9: ........
Given below are two statements:
Statement-I: | With the displacement wave we can produce a pressure wave. |
Statement-II: | Displacement and pressure waves both are having a phase difference of \(\frac{\pi }{2}\). |
1. | Statement I is incorrect and Statement II is correct. |
2. | Both Statement I and Statement II are correct. |
3. | Both Statement I and Statement II are incorrect. |
4. | Statement I is correct and Statement II is incorrect. |
If the transverse displacement of a string clamped at both ends is given by y(x,t)=12(cm) sin(6.28x)cos(3.14 t), where x is in cm and t is in seconds, then which of the following is not true?
1. | The velocity of the component wave is 0.5 cm/s. |
2. | The amplitude of one of the component waves is 6 cm. |
3. | The distance between two consecutive nodes is 0.5 cm. |
4. | x= 0.25 cm is the first node except the nodes at the ends. |