Discussion
Identify the two electromagnetic waves A and B having respective wavelengths 2 cm and 580 nm
Answer: A
A is a microwave and B is visible light.
Microwaves have wavelengths from about 1 mm to about 30 cm, so 2 cm is a microwave (radar and microwave ovens work in this range). Visible light runs from about 400 nm to 700 nm, so 580 nm is visible, yellow light.
Infrared lies between about 700 nm and 1 mm, too short for 2 cm. Radio waves are longer still, from tens of centimetres upward. Ultraviolet lies below 400 nm, too short for 580 nm.
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