A microwave oven uses wave with a

large wavelength in the invisible range

small wavelength in the visible range

large wavelength in the visible range

small wavelength in the invisible range

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2012

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A microwave oven uses microwaves, which are electromagnetic waves. Microwaves have wavelengths that are longer than visible light, infrared, and ultraviolet radiation, but shorter than radio waves. They fall within the radio spectrum and are invisible to the human eye. Therefore, they have a small wavelength relative to radio waves but are definitely in the invisible range. Compared to visible light, their wavelength is larger, but option D specifies ‘small wavelength in the invisible range’, which is correct relative to, say, radio waves or considering the typical options comparing ‘visible’ vs ‘invisible’ and relative wavelength size.

– Microwaves are part of the electromagnetic spectrum.
– They are invisible to humans.
– The wavelengths are typically in the centimeter range.

Microwave ovens commonly operate at a frequency of 2.45 GHz, which corresponds to a wavelength of approximately 12.2 cm. This wavelength is efficient at heating water molecules in food.

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