Answer:
This represents radiation in ultra-violet region . 
Explanation:
Energy of the orbit where n = 3 is given as follows 

 = -1.511 eV
 = -1.511 eV 
Energy of the orbit where n = 1 is given as follows 

 = 13.6 eV
 = 13.6 eV
Difference of [tex]E_3 and [tex]E_1 = - 1.511+ 13.6 
= 12.089 eV.
The wavelength of light having this energy in nm is given by the expression as follows 
Wavelength in nm = 1244 / energy in eV
= 1244 / 12.089
= 102.90 nm
This represents radiation in ultra-violet region . 
 
        
             
        
        
        
Answer:Although any object in motion through space (for example a thrown baseball, kicked football, fired bullet, thrown arrow, stone released from catapult) are projectiles, they are commonly found in warfare and sports.
Explanation:
 
        
                    
             
        
        
        
Answer:
Explanation:
Momentum is the mass of a moving body times its velocity. It can be transferred from one object to another
 
        
             
        
        
        
Answer:
 The horizontal distance traveled by the projectile is 15.23 m.
Explanation:
Given;
angle of projection, θ = 25⁰
initial velocity of the projectile, u = 15 m/s
time of flight, t = 1.12 s
The the travelling path of the object is calculated as the range of the projectile

Therefore, the horizontal distance traveled by the projectile is 15.23 m.