|
Noise is produced by |
|||
|
(a) |
vibration with high frequency |
(b) |
regular vibration |
|
(c) |
regular and periodic vibration |
(d) |
irregular and non-periodic vibration |
|
Noise is produced by |
|||
|
(a) |
vibration with high frequency |
(b) |
regular vibration |
|
(c) |
regular and periodic vibration |
(d) |
irregular and non-periodic vibration |