Question

comparing regions of the electromagnetic spectrum
gamma
ray
which has the longest wavelength?
x - rays
visible
microwave
which has the highest frequency?

Explanation:

Step1: Recall the relationship between wavelength and frequency in the electromagnetic spectrum

In the electromagnetic spectrum, wavelength and frequency are inversely related ($c = \lambda f$, where $c$ is the speed of light, $\lambda$ is wavelength, and $f$ is frequency). As we move from gamma rays to radio waves on the spectrum, the wavelength increases and the frequency decreases.

Step2: Identify the region with the longest wavelength

Looking at the labels (Gamma ray, X - rays, Ultraviolet, Visible, Infrared, Microwave, Radio), radio waves are at the far right of the spectrum (in the direction of increasing wavelength).

Step3: Identify the region with the highest frequency

Since frequency is inversely related to wavelength, the region with the shortest wavelength (gamma rays, at the far left of the spectrum) has the highest frequency.

Answer:

Which has the longest wavelength? Radio.
Which has the highest frequency? Gamma ray.