Two Oscilloscope
2009
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Two Oscilloscope
Planning skills!!!!!!!!Design of experiment help plz!!!?
Two students are having a discussion about an experiment in which the air inside a bell jar is gradually removed. The sound of a ringing bell inside the jar is heard to diminish in intensity during this process.
One student suggests that the frequency f of a sound wave and the pressure p are related by the equation
f = kp^2
where k is a constant.
Design a laboratory experiment to find out whether the student is correct. You should draw a diagram showing the arrangement of your equipment. In your account, you should pay particular attention to
(a) the procedure to be followed,
(b) the measurements that would be taken,
(c) how the frequency of the sound would be measured using a cathode-ray oscilloscope,
(d) the control of variables,
(e) how the data would be analysed,
(f) any safety precautions that you would take.
You get the answers from the questions really:
a) Draw a diagram and label it with a method, bell in jar, microphone and oscilloscope inside! Put a pressure gauge on the bell jar.
b) You need to take pressure and frequency measurements (at regular intervals of pressure change)
c) Ermmm? Use a microphone attached to an oscilloscope that gives a digital output for frequency?
d) Do not vary the temperature of the system or the gases used (air). Keep all the equipment the same.
e) Graph it on a scatter graph, look for a relationship between p^2 on one axis and frequency on the other. The gradient will be "k" if it is a straight line.
f) Severe risk of implosion of the glass. Safety screen and safety glasses required.
HEATHKIT OS-2 SCOPE.mp4
