The velocity of sound in air is:
1. | faster in dry air than in moist air. |
2. | directly proportional to the pressure. |
3. | directly proportional to temperature. |
4. | independent of the pressure of air. |
1. | Pressure | 2. | Density of gas |
3. | Above both | 4. | None of the above |
1. | they are moving in the opposite direction. |
2. | the phase between them is \(90^{\circ}\). |
3. | the phase between them is \(45^{\circ}\). |
4. | the phase between them is \(0^{\circ}\). |
1. | \(502\) | 2. | \(507\) |
3. | \(517\) | 4. | \(522\) |
1. | \(1:2\) | 2. | \(2:3\) |
3. | \(3:4\) | 4. | \(4:5\) |