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 is A A gamma wave B An infrared wave C A microwave D An ultraviolet wave (b) The picture shows a woman checking that a banknote is genuine. She is using a lamp which emits a radiation which is part of the electromagnetic spectrum. Explain how two different electromagnetic radiations enable the woman to check the banknote.

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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. This electromagnetic wave is ... 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

Step 1

This electromagnetic wave is

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The correct answer is B, An infrared wave. Infrared waves have a longer wavelength than visible light and are utilized in various applications, including thermal imaging.

Step 2

Explain how two different electromagnetic radiations enable the woman to check the banknote.

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Answer

Ultraviolet (UV) Radiation: Many banknotes contain security features that are visible only under UV light. When the woman shines UV light on the banknote, any fluorescent elements present will glow, allowing her to verify authenticity.
Visible Light: The woman also uses visible light to inspect the physical features of the banknote, such as watermarks and fine print. These features are designed to be easily seen when illuminated under normal lighting conditions.

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