A radio station transmits on 97.4 MHz - Edexcel - GCSE Physics - Question 5 - 2020 - Paper 1
Question 5
A radio station transmits on 97.4 MHz.
To receive the waves an aerial needs a length equal to half the wavelength of the radio waves being transmitted.
Calculate t... show full transcript
Worked Solution & Example Answer:A radio station transmits on 97.4 MHz - Edexcel - GCSE Physics - Question 5 - 2020 - Paper 1
Step 1
Calculate the wavelength of the radio waves
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Answer
To find the wavelength (
\lambda
) of the waves, use the formula:
λ=fv
where:
v = speed of the radio waves = 3.00 × 10^8 m/s
f = frequency = 97.4 MHz = 97.4 × 10^6 Hz
Calculating the wavelength:
λ=97.4×1063.00×108≈3.08m
Step 2
Calculate the length of the aerial
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Answer
The length of the aerial needs to be half the wavelength:
Length of aerial=2λ=23.08=1.54m
Step 3
Describe how the student should measure the angle of refraction
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Answer
Trace the path of the ray: Use a ruler to mark the ray of light entering the glass block and the point where it exits.
Draw normal lines: Draw a line perpendicular (normal) to the surface at the entry and exit points of the ray.
Use a protractor: Place a protractor at the point where the ray exits the block to measure the angle between the ray and the normal line.
