Question

By changing length of the scale protruding out a table and vibrating it we can produce sounds of different frequencies. This is possible due to :

• A. Change in frequency
• B. Change in velocity
• C. Change in amplitude
• D. All of the above

Answer 1

The correct option is A Change in frequency

Sounds of different frequencies are produces due to the change in the frequency.

When the length of the scale protruding out a table is longer it vibrates more slowly, so pushes molecules together less often, so the waves of molecules are further apart - the frequency of the sound waves are lower. Lower frequency waves have a lower pitch.

When the length of the scale is short it vibrates more quickly, so makes higher frequency pressure waves, which have a higher pitch.