Once all hydrogen is depleted the star begins to die
Answer:
c. 0.12 m/s
Explanation:
by using momentum formula 
we get

Answer:
Work done, W = 84.57 Joules
Explanation:
It is given that,
Mass of the wooden block, m = 2 kg
Tension force acting on the string, F = 30 N
Angle made by the block with the horizontal, 
Distance covered by the block, d = 3 m
Let W is the work done by the tension force. It can be calculated as :


W = 84.57 Joules
So, the work done by the tension force is 84.57 Joules. Hence, this is the required solution.
Monochromatic means a single colour (single frequency).
The frequency is 4.7 x 10^14 Hertz