fryer (vdf96) – Waves – graves – (6)
1
This printout should have 13 questions.
Multiplechoice questions may continue on
the next column or page – Fnd all choices
before answering.
001
10.0 points
The string of a cello playing the note “C”
oscillates at 264 Hz.
What is the period of the string’s oscilla
tion?
Correct answer: 0
.
00378788 s.
Explanation:
Let :
f
= 264 1
/
s
.
T
=
1
f
=
1
264 1
/
s
=
0
.
00378788 s
.
002
10.0 points
Microwaves travel at the speed of light, 3
.
00
×
10
8
m/s.
When the frequency of microwaves is 9
.
90
×
10
9
Hz, what is their wavelength?
Correct answer: 0
.
030303 m.
Explanation:
Let :
v
= 3
.
00
×
10
8
m
/
s
and
f
= 9
.
9
×
10
9
Hz
.
λ
=
v
f
=
3
×
10
8
m
/
s
9
.
9
×
10
9
Hz
=
0
.
030303 m
.
003
10.0 points
The distance between two successive crests of
a certain transverse wave is 1
.
29 m. Eight
crests pass a given point along the direction
of travel every 13
.
2 s.
Calculate the wave speed.
Correct answer: 0
.
781818 m
/
s.
Explanation:
Let :
λ
= 1
.
29 m
,
n
= 8 crests
,
and
Δ
t
= 13
.
2 s
.
v
=
f λ
=
n
Δ
t
λ
=
8
13
.
2 s
(1
.
29 m)
=
0
.
781818 m
/
s
.
keywords:
004
10.0 points
A harmonic wave is traveling along a rope. It
is observed that the oscillator that generates
the wave completes 40
.
2 vibrations in 34
.
4 s.
Also, a given maximum travels 434 cm along
the rope in 10
.
7 s.
What is the wavelength?
Correct answer: 34
.
7087 cm.
Explanation:
Let :
n
= 40
.
2 vibrations
,
t
1
= 34
.
4 s
,
Δ
x
= 434 cm
,
and
t
2
= 10
.
7 s
.
The speed of the wave is
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 Fall '10
 Graves
 Physics, Light, Wavelength, Metre, Standing wave, fryer

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