. Two loudspeakers are about 10 m apart in the front of a largeclassroom. If either speaker plays a pure tone at a singlefrequency of 400 Hz, the loudness seems pretty even as youwander around the room, and gradually decreases in volumeas you move farther from the speaker. If both speakersthen play the same tone together, what do you hear as youwander around the room?(a) The pitch of the sound increases to 800 Hz, and thesound is louder but not twice as loud. It is louder closerto the speakers and gradually decreases as you moveaway from the speakers—except near the back wall,where a slight echo makes the sound louder.(b) The sound is louder but maintains the same relativespatial pattern of gradually decreasing volume as youmove away from the speakers.(c) As you move around the room, some areas seem to bedead spots with very little sound, whereas other spotsseem to be louder than with only one speaker.(d) The sound is twice as loud—so loud that you cannothear any difference as you move around the room.(e) At points equidistant from both speakers, the sound istwice as loud. In the rest of the room, the sound is thesame as if a single speaker were playing.
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
. Two loudspeakers are about 10 m apart in the front of a large
classroom. If either speaker plays a pure tone at a single
frequency of 400 Hz, the loudness seems pretty even as you
wander around the room, and gradually decreases in volume
as you move farther from the speaker. If both speakers
then play the same tone together, what do you hear as you
wander around the room?
(a) The pitch of the sound increases to 800 Hz, and the
sound is louder but not twice as loud. It is louder closer
to the speakers and gradually decreases as you move
away from the speakers—except near the back wall,
where a slight echo makes the sound louder.
(b) The sound is louder but maintains the same relative
spatial pattern of gradually decreasing volume as you
move away from the speakers.
(c) As you move around the room, some areas seem to be
dead spots with very little sound, whereas other spots
seem to be louder than with only one speaker.
(d) The sound is twice as loud—so loud that you cannot
hear any difference as you move around the room.
(e) At points equidistant from both speakers, the sound is
twice as loud. In the rest of the room, the sound is the
same as if a single speaker were playing.
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