Page 43 - Q & A STPM 2022 Physics

Physics Semester 3 STPM Chapter 21 Sound Waves
Answer: D
Refer to the figure below.

N A N

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N N N

N N N N N

Question 6
A flute has a length of 33.0 cm. The speed of sound in air is 330 m s . What is
–1
the fundamental frequency of the flute, assuming it is a tube closed at one end
and open at the other?
A 100 Hz C 500 Hz
B 250 Hz D 1000 Hz

Answer: C

A

I = 0.33 m
Length of flute, l = 0.33 m = λ
2
v
Fundamental frequency, f 0 = = 330 Hz
λ 2(0.33)
= 500 Hz

Question 7
The lengths of the air column in a tube that resonant with a tuning fork of
frequency 512 Hz are 16.0 cm and 47.0 cm respectively. No resonance occurs
between 16.0 cm and 47.0 cm. What is the speed of sound in air? Semester
A 300 m s –1 C 330 m s
–1
B 317 m s –1 D 334 m s –1
3

403

021 STPM Q&A Physics T3.indd 403 17/02/2022 10:24 AM