Across
- 4. When sound waves travelling in air enter into water, the ¬¬¬¬¬¬¬¬¬________ remains constant
- 5. The change in density/ pressure of a medium from maximum value, to minimum value and again to maximum value, due to the propagation of a longitudinal wave is called a complete
- 8. An object moving at a speed greater than that of sound is said to be moving at _____ speed
- 9. When a sound wave travels in air, the physical quantity which is transferred from one place to the other is
- 10. Longitudinal wave cannot travel through________.
Down
- 1. ____________ is the properties of sound is affected by change in the air temperature
- 2. water waves are ______ waves
- 3. The sound wave having a frequency more than 20,000 Hz are called
- 6. A pendulum vibrates with a time period of 1 second. The sound produced by it is____
- 7. Ultrasonic waves are used for detecting objects under water. What technique/device is used for this
- 11. In the region of compression or rarefaction, in a longitudiual wave the physical quantity which does not change is