The solar atmosphere and the source of its energy
Answers are for parents and teachers.
1
The Earth is 12,500 km across; a prominence is 75,000 km high. How many Earth diameters?
6
2
At 600 km/s how many seconds does the wind need for 150,000,000 km? (150,000,000 : 600)
250000
3
If 2 kg of mass is fully converted, what is E (c² = 9 · 10¹⁶) in J? (18 · 10¹⁶ = 180,000,000,000,000,000)
180000000000000000
4
Why does fusion fit the Earth’s age, unlike the 19th-century contraction hypothesis?
Fusion supplies energy for billions of years, whereas contraction would last only tens of millions.
5
Why are neutrino detectors placed underground?
The rock shields from other cosmic particles; only neutrinos get through.