Which is the most common use for infrared waves? to determine relative distance to provide heat to carry cell phone conversations to transmit signals

Answer : To provide heat.

Explanation :

Infrared waves are the waves having wavelength 700 nm to 1 mm.

The most common use of infrared waves is "to provide heat" i.e. in heat-sensitive thermal imaging cameras. It is a invisible wave. It can only sensed by a sensation of warmth.

For example :

When an object is hot, It will emit energy in the form of infrared waves.

So, correct option is (b)

To provide Heat

Explanation:

Gradpoint question

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