Give one use of ultraviolet - AQA - GCSE Physics - Question 5 - 2021 - Paper 1
Question 5
Give one use of ultraviolet.
An ultraviolet wave has a wavelength of 300 nanometres.
Which of the following is equal to 300 nanometres?
Tick (✓) one box.
3 × 10⁷ m
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Worked Solution & Example Answer:Give one use of ultraviolet - AQA - GCSE Physics - Question 5 - 2021 - Paper 1
Step 1
Give one use of ultraviolet.
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Answer
Ultraviolet light can be used for energy efficient lamps.
Step 2
Which of the following is equal to 300 nanometres?
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Answer
Tick the box for 3 × 10⁷ m.
Step 3
Calculate the frequency of the ultraviolet wave.
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Answer
To find the frequency, use the formula:
v=fimesextwavelength
Where:
v = speed of the wave = 3 × 10⁸ m/s,
( \text{wavelength} = 3 \times 10^{-7} \text{m} ) (from Question 05.2).
Draw one line from each wave to the name of the wave.
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Answer
Wave E - Infrared
Wave F - Visible light
Wave G - X-rays
Step 5
Describe the difference between transverse and longitudinal waves.
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Answer
In a transverse wave, the oscillations or vibrations are perpendicular to the direction of energy transfer. In a longitudinal wave, the oscillations or vibrations are parallel to the direction of energy transfer.
