Some snakes have special sensory organs that detect the infrared region of the electromagnetic spectrum. Compared with human vision, these snakes can sense electromagnetic waves that have 1 a lower frequency and a shorter wavelength. 2 a higher frequency and a longer wavelength. 3 a lower frequency and a longer wavelength. 4 a higher frequency and a shorter wavelength.

Compared with human vision, these snakes can sense electromagnetic waves that have:

3. a lower frequency and a longer wavelength.

Explanation:

Human eyes are not able to detect the infrared region of the electromagnetic spectrum. We can experience it as heat when, for instance, we get close to a hot object. The snakes mentioned in the passage, however, have special sensory organs that can detect infrared, which means they sense waves that have a lower frequency and a longer wavelength than the ones visible to us. Let's compare infrared to what is detectable by human eyes:

Visible:wavelength: 400 nm – 700 nm; frequency: 790 THz – 430 THz.

Infrared:  wavelength: 700 nm – 1 mm; frequency: 430 THz – 300 GHz.

The longer the wavelength, the lower the frequency.

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