A-Level AQA Physics Longitudinal & Transverse Waves: Figure 2 shows a modern version

Question

Figure 2 shows a modern version of the apparatus used by Hertz to investigate the properties of electromagnetic waves. Electromagnetic waves are continuously emitted from a dipole transmitter. The electromagnetic waves are detected by a dipole receiver.

An oscilloscope is used to display the amplitude of the detected signal at the dipole receiver.

Figure 2

dipole transmitter

dipole receiver
oscilloscope

Figure 3 shows the same apparatus when the dipole receiver has been rotated through an angle of 90°.

Figure 4

Sketch a graph on Figure 4 to show how the amplitude detected by the dipole receiver varies with angle of rotation as the receiver is turned through 360°.

Start your graph from the position shown in Figure 2.

[3 marks]

Figure 4

amplitude of signal

angle of rotation in degrees

Maxwell derived the equation  $ c = \frac{1}{\sqrt{\mu_0 \epsilon_0}} $ for the speed $c$ of electromagnetic waves, where $
\mu_0$ is the permeability of free space and $
\epsilon_0$ is the permittivity of free space.

Explain, using a suitable calculation, this equation led to the conclusion that light is an electromagnetic wave.

[2 marks]

Figure 2 shows a modern version of the apparatus used by Hertz to investigate the properties of electromagnetic waves - AQA - A-Level Physics - Question 2 - 2018 - Paper 7

Worked Solution & Example Answer:Figure 2 shows a modern version of the apparatus used by Hertz to investigate the properties of electromagnetic waves - AQA - A-Level Physics - Question 2 - 2018 - Paper 7

Sketch a graph on Figure 4 to show how the amplitude detected by the dipole receiver varies with angle of rotation as the receiver is turned through 360°.

Explain, using a suitable calculation, this equation led to the conclusion that light is an electromagnetic wave.

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