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AQA A-level Physics Waves Required Practical 1 Exam Style Questions $3.96   Add to cart

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AQA A-level Physics Waves Required Practical 1 Exam Style Questions

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An assortment of AQA A-level physics Waves Required Practical 1 exam style questions. Mark scheme included in package deal.

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  • March 19, 2023
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  • 2022/2023
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1 A student investigates stationary waves with an elastic cord of circular cross-section attached to a
load, as shown in Fig. 1.1.

L
pulley




vibrator load
cord


Fig. 1.1

When the frequency of the vibrator is f, the cord vibrates with the stationary wave pattern shown.
The student investigates how f varies with the cross-sectional area A of the cord.

It is suggested that the relationship between f and A is

1 M
f=
2L kA

where L is the distance between the two nodes, M is the mass of the load and k is a constant.

Design a laboratory experiment to test the relationship between f and A.
Explain how your results could be used to determine a value for k.

You should draw a diagram, on page 3, showing the arrangement of your equipment.
In your account you should pay particular attention to:

● the procedure to be followed

● the measurements to be taken

● the control of variables

● the analysis of the data

● any safety precautions to be taken.




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2 A student is investigating stationary waves on a stretched elastic cord. A vibrator attached to the
cord is connected to a signal generator.

The apparatus is set up as shown in Fig. 2.1.


pulley elastic cord




vibrator
M


Fig. 2.1

The mass M attached to the cord is adjusted until resonance is obtained. The number n of
antinodes on the stationary wave is recorded.

The experiment is repeated with different masses to obtain different values of n.

It is suggested that M and n are related by the equation
n Mg
f=
2L n

where f is the frequency of the vibrator, g is the acceleration of free fall, L is the length of the
elastic cord and n is the mass per unit length of the elastic cord.
1
(a) A graph is plotted of M on the y-axis against on the x-axis.
n2
Determine an expression for the gradient.




gradient = .......................................................... [1]




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