Module
6
:
Problems for this module are
:
Chapter 16
1.
.
Light is an electromagnetic wave and travels at a speed of 3 00 x
/ .

,
108m s
The human eye is most sensitive to yellow green light which
.

.
has a wavelength of 5 45 x 10 7 m
What is the frequency of this light?
=
v λ
=
T fλ
= .

.
/ =
.
×

v 5 45 x 10 7 m3 00 x 108m s
5 50459 1014 s 1
=
=
f 1T 1
.
×
 =
.
×

5 50459 1014 s 1
1 81667 10 15 Hz
.
19
Two blocks are connected by a wire that has a mass per unit length of
.

/
.
.
8 50 x 10 4kg m
One block has a mass of 19 0 kg and the other has a mass
.
.
of 42 0 kg
These blocks are being pulled across a horizontal frictionless floor
.
by a horizontal force P that is applied to the less massive block
A transverse
/ (
wave travels on the wire between the blocks with a speed of 352 m s relative
).
to the wire
The mass of the wire is negligible compared to the mass of the
.
.
blocks
Find the magnitude of P
:
Tension in the wire
=
+
=
.
.
+
.
=
.
.
T Pm2m1 m2 P42 0 kg19 0 kg 42 0 kg P42 0 kg61 0 kg
:
Velocity of transverse wave
=
=
=
V Tρ V2ρ T
=
.
.
=
/
.

/
.
.
≈
.
P V2ρ61 0 kg42 0 kg 352 m s28 50 x 10 4kg m61 0 kg42 0 kg 152 96 N
.
37
,
As the drawing illustrates a siren can be made by blowing a jet of air
.
through 20 equally spaced holes in a rotating disk
The time it takes for
.
successive holes to move past the air jet is the period of the sound
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 Spring '10
 BRUMM
 Physics, Light, Hertz, Wavelength

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