Solve these clues to fill the grid.
- People who have severe hearing impairments
- 1 Across
- The part of a gunlock that strikes the percussion cap when the trigger is pulled
- 3 Across
- A logarithmic unit of sound intensity
- 6 Across
- A heavy block of iron or steel on which hot metals are shaped by hammering
- 8 Across
- The distance between two points in the same phase in consecutive cycles of a wave
- 10 Across
- The number of occurrences within a given time period
- 12 Across
- Division of a usually ___ divided leaf
- 13 Across
- A reply that repeats what has just been said
- 2 Down
- The main cavity of the ___
- 4 Down
- Sound of any kind
- 5 Down
- The property of sound that varies with variation in the frequency of vibration
- 7 Down
- The phenomenon of a propagating wave being thrown back from a surface
- 9 Down
- A state of mental or emotional strain or suspense
- 11 Down