The Sun and its photosphere
Answers are for parents and teachers.
1
Take the solar constant as 1350 W/m² (rounded). What is the power at 3 AU? (1350 : 9)
150
2
A spot is 30″ across, 1″ ≈ 725 km. How many km?
21750
3
The Earth’s diameter is ≈ 12,700 km. A 25,400 km spot equals about how many Earth diameters?
2
4
How are sunspots linked to magnetic fields?
A strong magnetic field suppresses convection, less heat arrives and the region cools.
5
Why is it dangerous to look at the Sun through binoculars? Write one sentence.
The lenses concentrate sunlight and burn the retina instantly.