Answer:
As much I know the gravity on moon is 1.62m/s२.
 
        
             
        
        
        
Scattering occurs when light changes direction after colliding with particles of matter.
        
             
        
        
        
Answer:
The correct answer is "22.27 hours".
Explanation:
Given that:
Radioactive isotope activity,
= 490,000 Bq
Activity,
= 110,000 Bq
Time,
= 48 hours
As we know,
⇒ 
or,
⇒ 
By taking "ln", we get
⇒ 
By substituting the values, we get
⇒ 
⇒    
                  
As,
⇒ 
then,
⇒ 
⇒ 
           
   
 
        
             
        
        
        
Answer:
Explanation:
Distance travelled by wave = 8 x 2 = 16 m 
Time taken = 4 s 
velocity of pulse wave = distance / time 
= 16 m / 4 s 
= 4 m/s 
 
        
             
        
        
        
Since it is dropped, initial velocity u = 0
Using s = ut + (1/2)gt^2,        putting u = 0,  g = 10 m/s^2
s =(1/2)gt^2,                  t = 3s
s = 0.5 * 10 * 3 *3
s = 45 m.
The bridge is 45m above the water.