Question

If we strike a water-filled bowl with a spoon, then why is there variation in the sound produced due to the change in water level of the bowl?
A. due to change in pitch
B. due to change in amplitude
C. both A and B
D. None of the above

Answer 1

Hint: We will utilize the concept of the relation between frequency and wavelength of sound produced when we strike a water-filled bowl spoon. We also know that the frequency and pitch are directly interrelated to each other; hence this relation will lead us to the final answer.

Complete step by step answer:
It is given that if we strike a water-filled bowl with a spoon. We have to explain the variation in sound production if the water level in the bowl changes.

When we strike the spoon on the bowl, there is a production of vibrations resulting from which sound is produced. If we change the bowl's water level, the length of the air column present in the bowl also changes, which is a primary cause of vibrations. So the vibrations of sound changes due to the change in the length of the air column. We know that frequency and wavelength are dependent on vibrations, and if vibration varies, then these two quantities also change. We also know that pitch is the sensation of frequency. We can say that pitch is directly proportional to frequency, and frequency varies with the change in water level; hence pitch also changes.

Therefore, we conclude that if we strike a water-filled bowl with a spoon, there is a variation in the sound produced due to change in the bowl's water level due to change in pitch

So, the correct answer is “Option A”.

Note:
It would be better if we perform the given experiment in a still environment so that the effect of variation in the atmosphere is minimal. Also, it is not necessary to know which quantity is decreasing or increasing; we only have to see its dependency on variation in the sound that is whether it is changing or not.