Answer:
Among force and impulse, There is a lesser calculation for impulse. Also, it has same dimensions as momentum. Hence that is most closely related.
 
        
             
        
        
        
First, we know that the ball is not in motion, so the acceleration is 0
T45 = Fg/sin45  = 100N/sin 45   = 141 N
Thor = T45 cos 45 = 141 N cos45
= 100 N
hope this helps
        
             
        
        
        
Answer:
3 photons 
Explanation:
The energy of a photon E can be calculated using this formula:

Where  corresponds to Plank constant (6.626070x10^-34Js),
 corresponds to Plank constant (6.626070x10^-34Js),  is the speed of light in the vacuum (299792458m/s) and
 is the speed of light in the vacuum (299792458m/s) and  is the wavelength of the photon(in this case 800nm).
 is the wavelength of the photon(in this case 800nm).

Tranform the units

The band Gap is 4eV, divide the band gap between the energy of the photon:

Rounding to the next integrer: 3.
Three photons are the minimum to equal or exceed the band gap.