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4.3 Wave characteristics
4. Oscillations and waves
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
The intensity of light at 1.3 m from
a lamp is 1.0 W m
-2.
Calculate the
output power of the lamp
What is the intensity of the lamp
from the worked example at 0.7
m.
What is the intensity of the lamp
at a distance of 255 cm?
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.
4.3 Wave characteristics
4. Oscillations and waves
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
Light transmits through a polariser
with an intensity of 5.4 W m
-2
.
What is the intensity of the light
when it has transmitted through
an analyser at an angle of 180
o
.
Light transmits through a polariser
with an intensity of 5.4 W m
-2
.
What is the intensity of the light
when it has transmitted through
an analyser at an angle of 45
o
.
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.
