Question

A microphone is connected to the Y-input of a C.R.O. Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produced on the screen are shown in Figure. Which trace is due for the sound with the lowest pitch?

• A. a
• B. b
• C. c
• D. all the above

Answer 1

The correct option is A a

The trace a has the lowest pitch as the frequency of the wave is least among the three traces given in the question. Pitch is determined by the frequency of a wave, and frequency is the combination of wavelength and speed at which the wave is traveling. Pitch describes how high or low a tone is and depends upon the rapidity with which a sounding body vibrates, i.e., upon the frequency of vibration. The higher the frequency of vibration, the higher the tone or pitch.