Basic Qualification · B-007 Radio wave propagation · B-007-005-003
What is solar flux?
- AThe number of sunspots on the side the sun facing the Earth
- BThe density of the sun's magnetic field
- Cfrequency energy
- DA measure of the tilt of the Earth's ionosphere on the side toward the sun
Correct answer: C — frequency energy. From the official ISED question bank, verified word for word.
Why
Solar flux measures the amount of radio frequency energy the Sun emits at a specific wavelength, acting like a brightness gauge for our star's radio output. The full explanation — and one for every question — is in Pro.
Practise this section
Radio wave propagation is section B-007 of the Basic exam: How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.
Drill B-007 — free, no account