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A specific electromagnetic wave has a frequency greater than visible light - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1
Question 5
A specific electromagnetic wave has a frequency greater than visible light. The wavelength of this wave is longer than that of X-rays. Complete the sentence by putt... show full transcript
Worked Solution & Example Answer:A specific electromagnetic wave has a frequency greater than visible light - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1
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Step 2
Explain how two different electromagnetic radiations enable the woman to check the banknote.
Answer
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Ultraviolet Light: This type of radiation is often used in checking banknotes because certain features are only visible under UV light. For example, some banknotes have security markings that fluoresce when exposed to ultraviolet light, indicating authenticity.
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Visible Light: The woman uses visible light from her lamp to examine the banknote for other security features, such as watermarks and color-shifting prints, which are critical for determining if the banknote is genuine.