The pitch of a sound is most closely related to its:
Wave form
Period
Amplitude
Frequency
The frequency of silent whistle is:
20,000 Hz – 25000Hz
2000 Hz – 2500Hz
200 KHz – 2000 Hz
25000 KHz
At room temperature, electrons cannot escape the metal surface due to ………….. of atomic nucleus:
Repulsive forces
Attractive forces
Gravitational forces
Electromagnetic forces