If a sunspot has a temperature of 4,500 K and the surrounding solar surface has a temperature of 5,800 K, how many times brighter is the surface compared to the sunspot?
a. 0.28
b. 0.36
c. 2.8
d. 3.6
e. 36
Question 2
Geosynchronous satellites
a. have an orbital period of 24 hours. b. remain above a geographical point on Earth while Earth rotates underneath.
c. have an orbital period of 24 hours and remain above a geographical point on Earth while Earth rotates underneath. d. None of the other choices are correct.