FM19 P12 Q28 Sound Interference Intensity Graph | Feb/March 2019 | Cambridge A Level 9702 Physics

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9702/12/F/M/19: Two identical loudspeakers are connected in series to an a.c. supply, as shown. A microphone is moved along the line PQ. Which graph best shows the variation with distance from P of the intensity of the sound detected by the microphone? #9702m19p12 #ASinterferenceP1 #Lv3
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5 июн 2021

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Комментарии : 6

@KateK-zh4vf 3 месяца назад

But it were light, instead of sound would it be "B"

@afifrazam6591 3 года назад

so for in this case for intensity of light can be 0 (cancel out completely) is it?

@ETphysics 3 года назад

For a table-top-sized experiment in vacuum, possible to cancel out completely! But in real life, even the light also will decrease in intensity ever so slightly

@Elpsycongroo1130 Год назад

What about dstructive interefence

@Ri-oy8hx Год назад

Doesn’t the waves cancel completely despite their difference in distance travelled when their path difference is X.5 lambda as they are coherent waves, according to the explanation of examiners report , apart from the reason of background

@IsaacKayelu 25 дней назад

That's what I know as well. At minima points, destructive interference occurs where coherent waves in anti phase superpose to give 0 Amplitude. I=A*2 hence Intensity will also be 0. I have never learn't that distance traveled reduces the amplitude of waves?? Kindly clarify on the ERs explanation if possible ma'am.I'm confused! thanks @ETphysics