A factory uses sound waves to check ceramic components for small internal defects.
Both sound waves travel through the same ceramic material.
| Source | Information about the source |
|---|---|
| P | produces 3600 complete vibrations in 1.8 ms |
| Q | produces sound with a frequency of 0.50 MHz |
Calculate the frequency of the sound produced by source P.
State the type of sound produced by source P.
Explain which source should be used to detect the smallest internal defects.