Microwaves are electromagnetic waves having frequencies in range of
- (a)300 KHz – 3 MHz
- (b)3 MHz – 300 MHz
- (c)1 GHz – 300 GHz
- (d)300 GHz – 400 THz
Correct — C, 1 GHz - 300 GHz. Microwaves are the band of the electromagnetic spectrum with frequencies of roughly 1 GHz to 300 GHz (wavelengths ~ 1 m down to 1 mm), lying between radio waves and infrared. They are used in radar, satellite links and microwave ovens.
- (a)300 KHz - 3 MHz — This is the medium-frequency radio band, far below microwaves.
- (b)3 MHz - 300 MHz — This covers HF/VHF radio waves, not microwaves.
- (d)300 GHz - 400 THz — This is the infrared region, above the microwave band.
The electromagnetic spectrum runs from radio waves (lowest frequency) through microwaves, infrared, visible light, ultraviolet, X-rays to gamma rays (highest). Microwaves occupy roughly the 1-300 GHz range.
Order the spectrum by frequency. Microwaves sit above radio waves and below infrared — about 1 GHz to 300 GHz.
- Microwaves: ~1 GHz to 300 GHz (wavelengths ~1 m to 1 mm).
- They lie between radio waves and infrared.
- Used in radar, satellite/mobile communication and microwave ovens.
- Higher frequency = higher energy in the EM spectrum.
- Confusing microwaves with radio or infrared bands
- Reversing the frequency-wavelength relationship
Spectrum-band recall — microwaves ~1-300 GHz.
No directly related past PYQ was found.
- practice — not a real PYQ
In the electromagnetic spectrum, microwaves lie between which two bands?
- (a)Radio waves and infrared
- (b)Infrared and visible light
- (c)Ultraviolet and X-rays
- (d)X-rays and gamma rays
Answer(a) Radio waves and infrared.
- practice — not a real PYQ
Which household appliance uses microwaves to heat food?
- (a)Microwave oven
- (b)Refrigerator
- (c)Toaster
- (d)Induction cooktop
Answer(a) Microwave oven.