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a) A specific electromagnetic wave has a frequency greater than visible light - Edexcel - GCSE Physics - Question 5 - 2015 - Paper 1
Question 5
a) A specific electromagnetic wave has a frequency greater than visible light. The wavelength of this wave is longer than that of X-rays. This electromagnetic wave ... show full transcript
Worked Solution & Example Answer:a) 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
The woman can use two types of electromagnetic radiation:
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Ultraviolet (UV) Radiation: Many banknotes contain security features that are only visible under UV light. For instance, specific inks or fibers in the banknote fluoresce when exposed to UV light, helping to verify its authenticity.
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Visible Light: The woman can also use visible light to examine other security features in the banknote, such as watermarks or color-shifting inks, which are designed to be visible under normal lighting conditions. This method allows for a straightforward visual inspection for validity.