Ending the adjectives with -ed is not needed, so those answers are out. As for the numbers, the rule is usually that numbers one through nine are spelled out whereas number 10 and up are written in numbers. That said, you do not hyphenate the number with the word, so four-letter word would be correct.

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4 years ago

Some snakes have special sensory organs that detect the infrared region of the electromagnetic spectrum. Compared with human vis

Semenov [28]

Answer:

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.

4 0

3 years ago