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1 The amplitude of any wave is not affected by the medium of propagation. 2  Sound waves propagating in air have a lower amplitude than sound waves propagating under water.  Electromagnetic waves propagating in air have a higher amplitude than electromagnetic waves propagating under water.
6. What causes waves on the ocean? Wind causes waves on the ocean. 7. What are the waves in the Earth called (Earthquake waves)? The waves in the Earth are called seismic waves. 8. Define frequency. Frequency is how fast a wave travels. 9. Define amplitude. Amplitude is the height of the wave. 10. What kind of wave travels by squeezing and spreading? (Give an example). Compression waves travel by squeezing and spreading. 11. What is it called when a wave bounces back and comes back to the source? It is called an echo or a reflection when a wave bounces back and comes back to the source. 12. What is sonar? Sonar is using sound waves to tell how far something is.