Question

What is pitch and loudness of a sound wave related to?

Answer 1

Answer:

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.

The amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound. In Figure 10.2 sound C is louder than sound B. The vibration of a source sets the amplitude of a wave.

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Answer 2

$\Large{ \cdot{ \underline{ \purple{ \rm{Pitch}}}}}$

The frequency determines the pitch of the sound. The frequency is the no. of oscillation per second. It determines how high or low, we can perceive the sound. When the frequency of sound increases, the pitch also increases. Pitch is also known as shrillness.

$\large{ \boxed{ \rm{ \red{Pitch\: \propto \:Frequency}}}}$

Have you ever noticed the difference between a female's voice and a man's voice? Yeah!, the difference arise due to different frequencies. The female have thin high pitched voice but Male have grave and low pitched voice.

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$\Large{ \cdot{ \underline{ \purple{ \rm{Loudness}}}}}$

The loudness refers to the intensity of the sound perceived by us. Here, intensity means the energy carried by sound per unit area per unit time. The loudness depends upon the amplitude i.e. the maximum displacement of the sound wave. The greater the amplitude, more is the volume or loudness. The loudness is calculated in decibels. Human ear can heard 0-180 dB.

$\large{ \boxed{ \rm{ \red{Loudness \: \propto \: (Amplitude) {}^{2} }}}}$

Yes, we should always remember that loudness and intensity are not same. Loudness is a subjective property whereas intensity is a objective property.

The jet planes, loudspeakers, traffic and several other noises are louder than normal talks, whispering etc.

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