When two waves of same amplitude but slightly different frequencies are added, t

Question

When two waves of same amplitude but slightly different frequencies are added, they interfere constructively, the total intensity of the waves the sum of individual intensities. they interfere destructively, the total intensity of the waves is zero the waves alternate between constructive and destructive interferences at a rate called the beat frequency. Click the tab called: Listen with varying Air Pressure Place a checkmark in: Audio enabled Select: Listener With the pressure at 1 ATM and frequency set to 500Hz, click: Remove Air from Box. As the air leaves the box, the sound heard by the listener slowly disappears because the air is needed to amplify the sound waves. vary the frequency of the sound waves. carry the sound waves. None of the above.

Explanation / Answer

(a)

when two waves of same amplitude but slightly defferent frequencies are added,

The waves alternate b/w constructive and destructive interference and cuases perception of beat

at the rate of beat frequency.

optiona 3 is correct.

(b)

since, sound wave is a mechanical wave. so it needs a medium to travel.

When we remove air from a box, sound heard by listener slowly disappear.

Because air is leaving the box slowly.

lt means no air , no sound is heard.

option 3 (air carry the sound wave) is correct.

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