Free Printable FSKS 123: Chapter 17 (Superposition)

1.

The drawing shows four moving pulses. Although shown as separated, the four pulses exactly overlap each other at the instant shown.

Which combination of these pulses would produce a resultant pulse with the highest peak and the deepest valley at this instant?

a)

1 and 2

b)

2,3 and 4

c)

2 and 3

d)

1 and 3

2.

Two sounds interacting produces a louder sound when the path length difference between the speakers and the listener is (a) wavelengths. This process is known as (b)

Choose from the below words

1,2,3,...

0.5, 1.5, 2.5,...

constructive interference

destructive interference

diffraction

refraction

3.

Two sounds interacting produces a no sound when the path length difference between the speakers and the listener is (a) wavelengths. This process is known as (b)

Choose from the below words

constructive interference

0.5, 1.5, 2.5,...

destructive interference

1.0, 2.0 , 3.0, ....

diffraction

refraction

4.

Two birds generate identical 343Hz sound waves which arrive at a person's ear after traveling 2.0 m and 2.5 m, respectively. The speed of sound in air is 343m/s.

Describe the sound heard by the person.

a)

Same as the original sound

b)

Louder sound

c)

No sound

d)

Softer than original sound, but not zero sound

5.

A loudspeaker is producing sound of a certain wavelength. Which combination of the wavelength λ (expressed as a multiple of $\lambda\ _{0\ }$ ) and the speaker’s diameter D (expressed as a multiple of D0) would exhibit the lowest amount of diffraction when the sound leaves the speaker and enters the room?

a)

$\lambda\ =\lambda\ _{0\ }\ ;\ D\ =\ D_0$

b)

$\lambda\ =2\lambda\ _{0\ }\ ;\ D\ =\ D_0$

c)

$\lambda\ =\lambda\ _{0\ }\ ;\ D\ =2D_0$

d)

$\lambda\ =3\lambda\ _{0\ }\ ;\ D\ =\ 2D_0$

6.

A young boy stands in a 3.5 m wide alley between two very tall buildings and shouts to a friend standing 15 m in front of one of the buildings and 5.0 m to the side of the alley. The boy will hear sounds that travel at an angle of (a) degrees

At this angle, what sound frequencies will the second boy hear?

(b)

The speed of sound in air v=343 m/s

Choose from the below words

379 Hz

$18.4\degree$

71.6\degree

19.5\degree

70.5\degree

310 Hz

1087 Hz

1.10 Hz

7.

What must be the diameter D of a circular speaker to produce a 15kHz tone with a diffraction angle of 35°

a)

0.05 m

b)

50 m

c)

0.04 m

d)

31 905 m

e)

26 151 m

8.

Two waves of a different frequency $f_1\$ and $f_2$ meet each other to create a beats with a frequency of 40 Hz.

What could be the frequency of the waves?

Select all valid combinations!

a)

$f_1=20\ Hz\ ;\ f_2\ =\ 20\ Hz$

b)

$f_1=40\ Hz\ ;\ f_2\ =\ 80\ Hz$

c)

$f_1=100\ Hz\ ;\ f_2\ =\ 60\ Hz$

d)

$f_1=10\ Hz\ ;\ f_2\ =\ 30\ Hz$

9.

Reorder the following from lowest frequency to the highest frequency standing waves

a)

b)

c)

d)

1)

2)

3)

4)

10.

A 1.5 m long string, fixed at both ends, has a fundamental frequency of 120 Hz. What is the speed of waves traveling on the string?

a)

40 m/s

b)

80 m/s

c)

180 m/s

d)

360 m/s

FSKS 123: Chapter 17 (Superposition)

Total questions: 10

Worksheet time: 50mins

Similar Resources on Wayground