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Progressive and stationary waves

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Question 17
a.

Using the relation for the speed of electromagnetic waves in a particular dielectric oil, v=1μεv = \frac{1}{\sqrt{\mu \varepsilon}}v=με​1​, calculate the theoretical speed of the waves in this medium to four significant figures.

Use the values:

  • Permeability of the oil, μ=1.257×10−6 H m−1\mu = 1.257 \times 10^{-6}\,\text{H m}^{-1}μ=1.257×10−6H m−1
  • Permittivity of the oil, ε=1.989×10−11 F m−1\varepsilon = 1.989 \times 10^{-11}\,\text{F m}^{-1}ε=1.989×10−11F m−1
[3]
b.

In an experiment to study stationary waves in this medium, a transmitter is immersed in a tank of this oil. The transmitter operates at a frequency of 400 MHz400\,\text{MHz}400MHz and is directed towards a flat metal plate acting as a reflector, positioned 1.5 m1.5\,\text{m}1.5m away. Deduce whether this experimental arrangement is suitable for determining the speed of the waves in the oil by detecting the positions of nodes and antinodes. Support your answer with a calculation of the distance between adjacent nodes.

[4]
Markscheme

Progressive and stationary waves Questions

  1. A Level
  2. /Physics
  3. /Progressive and stationary waves

25 exam-style questions on AQA A Level Physics Progressive and stationary waves, covering Progressive waves, Longitudinal and transverse waves, and Principle of superposition of waves and formation of stationary waves. Each one has a worked solution and a mark scheme showing where the marks go.

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