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4.2 Travelling waves
4. Oscillations and waves
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
A sound wave of wavelength 15 m
travels at 330 m/s. What is the
frequency of the sound?
A wave has a frequency of 32 Hz
and a wavelength of 10.5 m. What
is the velocity of the wave?
Green light travels at a speed of
300 000 000 m/s. The wave has a
wavelength of 500 x 10
-9
m. What
is the frequency of the light?
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
λ = 15 m
v = 330 m/s
f = ?
Convert any data to appropriate
values (for example g to kg, or cm
to m)
λ = 15 m
v = 330 m/s
f = ?
Write down the equation that links
the variables together
v = fλ
Rearrange the equation to make
the unknown the subject
f = v/λ
Substitute your data into the
equation, including the units
f = v/λ
f = (330 m/s) / 15 m
f = 22 Hz
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
f = 22 Hz
4.2 Travelling waves
4. Oscillations and waves
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
A wave has a frequency of 12.5
MHz cm. It has a wavelength of
0.4 cm. Calculate the wave
speed.
11 waves go past a point in 24
seconds. What is the frequency of
the waves?
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
Convert any data to appropriate
values (for example g to kg, or cm
to m)
Write down the equation that links
the variables together
Rearrange the equation to make
the unknown the subject
Substitute your data into the
equation, including the units
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
