DP Physics (last assessment 2024)

Question 20N.2.SL.TZ0.4b

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.2.SL.TZ0.4b
Level	SL	Paper	2	Time zone	TZ0
Command term	Predict	Question number	b	Adapted from	N/A

[Maximum mark: 2]

20N.2.SL.TZ0.4b

Two loudspeakers, A and B, are driven in phase and with the same amplitude at a frequency of $850 Hz$ . Point P is located $22.5 m$ from A and $24.3 m$ from B. The speed of sound is $340 m s^{- 1}$ .

(b)

A microphone moves along the line from P to Q. PQ is normal to the line midway between the loudspeakers.

The intensity of sound is detected by the microphone. Predict the variation of detected intensity as the microphone moves from P to Q.

[2]

Markscheme

«equally spaced» maxima and minima ✓

a maximum at Q ✓

four «additional» maxima «between P and Q» ✓

Syllabus sections

Core

Core » Topic 4: Waves » 4.4 – Wave behaviour

Core » Topic 4: Waves

Question 20N.2.SL.TZ0.4b

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