Answer :
In dry air at 20 °C (68 °F), the speed of sound is 343.2 metres per second (1,126 ft/s).
A, B, C and D are different because you get different pitches.
The sound emitted by each string is traveling through the same medium (the air) and the speed of sound through the air is a constant.
B is incorrect. Since speed of sound through the air is a constant;
A, B, C and D are different because you get different pitches.
The sound emitted by each string is traveling through the same medium (the air) and the speed of sound through the air is a constant.
B is incorrect. Since speed of sound through the air is a constant;