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4.4 Wave characteristics
4. Oscillations and waves
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
The distance between the slits in
a Young’s slits experiment is 0.20
mm. The screen is 42 cm from the
slits, and the maxima in the
interference pattern are 1.2 mm
apart. What is the wavelength
used?
The distance between the slits in
a Young’s slits experiment is 0.40
mm. The screen is 114 cm from
the slits, and the maxima in the
interference pattern are 2.2 mm
apart. What is the wavelength
used?
The distance between the slits in
a Young’s slits experiment is 0.80
mm. The screen is 198 cm from
the slits, and the maxima in the
interference pattern are 2.8 mm
apart. What is the wavelength
used?
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
d = 0.2 mm
D = 42 cm
s = 1.2 mm
λ = ?
Convert any data to appropriate
values (for example g to kg, or cm
to m)
d = 0.2
x 10
-3
m
D = 42
x 10
-2
m
s = 1.2
x 10
-3
m
λ = ?
Write down the equation that links
the variables together
s = λD / d
Rearrange the equation to make
the unknown the subject
λ = sd / D
Substitute your data into the
equation, including the units
λ =
(
1.2
x 10
-3
m x
0.2
x 10
-3
m) /
42
x 10
-2
m
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.
λ =
5.7 x 10
-7
m
4.4 Wave characteristics
4. Oscillations and waves
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
Light of wavelength 650 nm is
shone between a double slit with
a slit separation of 0.32 mm. The
screen is 4 m from the double-slit.
What is the separation between
the zeroth maxima and the fi rst
order maxima?
Light of wavelength 650 nm is
shone between a double slit with
a slit separation of 0.32 mm. The
separation between the zeroth
maxima and the fi rst minimum is
0.35 mm. What is the distance
between the screen and the
double-slit?
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.
4.4 Wave characteristics
4. Oscillations and waves
