Question

which wavelengths are scattered when the sun is closest to a ground - based observer? select two
□ lowest frequency
□ short wavelength
□ long wavelength
□ highest frequency

Explanation:

Rayleigh scattering (relevant to sunlight scattering by atmosphere) depends on $\frac{1}{\lambda^4}$, so shorter wavelengths scatter more. Frequency $f$ and wavelength $\lambda$ are inversely related ($f = \frac{c}{\lambda}$, $c$=speed of light), so short wavelength corresponds to highest frequency. When the Sun is closest (e.g., noon), the path through atmosphere is shorter, but scattering still favors short/high-frequency waves.

Answer:

B. short wavelength, D. highest frequency