Across
5. It is the bouncing back of light as it meets a barrier.
7. It produces a stress-feeling
8. It helps bats and dolphins locate their prey.
10. The bending of light as it passes one medium to
another of diferent density
11. Ray from reflecting surface.
12. Refers to the multiple echoes in a certain place
13. The property of a tone that distinguishes it from
another tone of the same pitch and intensity produced
by instruments down
1. The to-and-fro of a molecules and acts as a
disturbance travels through a medium
2. Kind of reflection that don't produce image
3. A reflection on a smooth surface
4. The change in the frequency and oth of sound
due to the movement of either the source or the
istener
6. Å sound which is rellected off a surface
9. The original ray coming from the light source​