Question

Choose the correct alternative among the following, that correctly represent the graph given below.

• A. Both sound waves have different pitch.
• B. Sound wave $2$ have lower value of loudness.
• C. Both sound waves have same quality.
• D. Sound wave $2$ has more shrillness.

Answer 1

The correct option is B Sound wave $2$ have lower value of loudness.

We know that,
Pitch $\propto$ frequency and Loudness $\propto$ Amplitude.

Frequency of sound wave $1$ is same as the frequency of sound wave $2$, so both the sound waves have same pitch.

From the diagram, we can deduce that the amplitude of sound wave $2$ is less than the amplitude of sound wave $1$. So, the loudness of sound wave $2$ is lower than that of sound wave $1$.

Different wave forms suggest that the quality of sound waves is different for both the waves, as properties of sine wave form are different from that of square wave form.

Frequency of sound wave $1$ is same as the frequency of sound wave $2$, so both the sound waves have same shrillness as shrillness depends upon the frequency of sound wave.