Question

have you ever felt heat from a fireplace? or the warm rays of the sun? then youve encountered infrared waves! infrared waves are a type of electromagnetic wave. we cannot see infrared waves, but they are all around us. the unique characteristics of infrared waves have led to their use in tv remote controls, thermal imaging cameras, and devices that monitor earth and space.
this model shows different types of electromagnetic waves.
the electromagnetic spectrum
wavelength (m)
frequency (hz)
complete the sentence.
compared to visible light, infrared waves have ____ wavelengths, have __ frequencies, and carry ____ energy.

Explanation:

Step1: Compare wavelength values

From the spectrum, infrared wavelength range is $10^{-6}$ to $10^{-3}$ m, visible light is $10^{-7}$ to $10^{-6}$ m. So infrared has longer wavelengths.

Step2: Compare frequency values

Infrared frequency range is $10^{12}$ to $10^{15}$ Hz, visible light is $10^{15}$ to $10^{16}$ Hz. So infrared has lower frequencies.

Step3: Relate frequency to energy

Electromagnetic wave energy follows $E=h
u$ ($h$ = Planck's constant, $
u$ = frequency). Lower frequency means lower energy. So infrared carries less energy.

Answer:

Compared to visible light, infrared waves have longer wavelengths, have lower frequencies, and carry less energy.