Speed of light ____ speed of sound.

1 kHz = ____Hz.

The SI unit of speed of sound is ____.

The audible frequency range of an average human ear is ____.

• Sound which has frequency less than 20Hz is called infrasound.
• Sound which has frequency more than 20KHz is called Ultrasound.

The formula for calculating the speed of a sound wave is v = ____.

The distance covered by a sound wave in a unit time is called ____.

The loudness of a sound decreases as we move away from a source of the sound. This is because _____.

The loudness of sound I is ____ to the loudness of sound II.

The picture below shows sound waves in different colors. Pick the color of the sound wave which is of the lowest frequency.

The picture below shows three sound wave forms. They have the same ____.

Which of the following has the lowest frequency and lowest amplitude?

Which of the following has the highest frequency and lowest amplitude?

Which of the following sounds shows the lowest pitch?

Given below are the sound wave forms of the voices of a boy and a girl. The amplitude of the boy’s voice is ____ the amplitude of the girl’s voice.

The time period of the sound wave whose frequency is 0.5 Hz is ____s.

The frequency of a sound wave whose time period is 0.01s is ___ Hz.