Astro

Question 1

What assumptions are made when calculating surface temperature of a star?

Answer 1

The star is a black body
The star is spherical
The surface temperature is constant/uniform
No energy is absorbed between earth and the star

Question 2

What is an inertial frame of reference?

Answer 2

Frame of references that is at rest / constant speed

Question 3

What is a non inertial frame of reference?

Answer 3

Frame of reference that is accelerating

Question 4

What is the equivalence principle?

Answer 4

It is impossible to tell the difference between the effects of gravity and acceleration

Question 5

Which clock runs slower and why?
A clock on board a spacecraft which is accelerating in deep space or a clock on earth

Answer 5

The clock on the surface of the earth would run more slowly as the gravitational field for the spacecraft is smaller

Question 6

Schwarzchjld radius

Answer 6

The distance from the centre of a mass to the event horizon