Acoustics

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. Sound cannot propagate through .
2. Sound waves are waves that can travel through any medium (solids, liquids, gases). 3. The speed of sound depends on the of the medium.
4. As sound travels through a medium, the particles of the medium along the direction of propagation of the wave.
5. A sound wave consists of higher pressure called .
6. is a place of lower pressure in sound waves.
7. Sound waves with a frequency ranging between 20 Hz and 20,000 Hz are called waves.
8. Sound waves with a frequency below 20 Hz that cannot be heard by the human ear are called waves.
9. Sound waves with a frequency greater than 20 kHz are called waves.
10. Sound waves travel in air with a speed of about m/s at NTP.