Intensities are scaled by factors of
A normal conversation have sound intensities of 3×10-6Wm-2. The decibel level for the intensity is
The level of noise recommended in most countries over an eight-hour workday is usually
If a nurse counts 68 heartbeats in 1 minute, then the period of heartbeats should be
Human voice results from the vibration of
As compare to air, sound waves travel
We can “see” sound waves by using
Bats can hear frequencies up to
The unit of intensity is
The sounds which have a jarring and unpleasant effect on our ears is called
The technique used to absorb noise by using soft and porous surfaces is called
Multiple reflections are called
SONAR ranging is also used to see the object's
The wavelength of ultrasonic waves is
The frequency range for ultrasound is
A sound wave has a frequency of 3 KHz and wavelength 20 cm. How much will it take to travel 2 km?
The characteristic of sound by which we can distinguish between two sounds of same loudness and pitch is known as
A human hearing can not hear a sound of frequency more than
A marine survey ship sends a sound wave to the seabed which receives an echo after 2.5 s. The speed of sound in seawater is 1200 ms-1. The depth of the sea is
A higher pitch means the
A boy clapped his hands near a cliff and heard the echo 3 s later. If the speed of the sound is 346 ms-1, then the distance of the cliff from the boy is
From the following, the example of a longitudinal wave is
As compared to men, the frequency of the voice of ladies and kids is
The difference between the loudness of the unknown sound and the loudness is
Sound is produced by
If a doctor counts 80 heartbeats in 1 minute, then the frequency of heartbeats should be
The intensity level of the faintest audible sound is
When sound interacts with materials and boundaries, it displays all the properties of
The range of the frequencies which a human ear can hear is called the
The sensation of sound persists in our brain for about
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