Answer:infrared radiation 
Explanation:
Most remote control uses infrared radiation
 
        
             
        
        
        
I think it’s D) all of the above
        
                    
             
        
        
        
Answer:
Explanation:
A ) 
At the bottom of the circle , the potential energy of the stopper is converted into kinetic energy 
1/2 m V² = mg x 2r + 1/2 mv²
m is mass of stopper , V is velocity at the bottom , r is radius of the circular path which is length of the string , v is velocity at the top
1/2  V² = g x 2r + 1/2 v²
  V² = g x 4r +  v²
  V² = 9.8 x 4 +  8²
V² = 103.2
V = 10.16 m/s
B )
If T be the tension at the top 
Net downward force 
= mg + T . This force provides centripetal force for the circular motion 
mg +T = mv² / r 
T =   mv²/r -mg
= m ( v²/r - g ) 
= .005 ( 8²/1 -g )
= .005 x 54.2
= .27 N . 
C ) At the bottom 
Net force = T  - mg , T is tension at the bottom , V is velocity at bottom
T-mg = mV²/r
T = m ( V²/r +g )
= .005 ( 10.16²/1 +9.8)
= .005 x 113
= .56 N . 
 
        
             
        
        
        
Answer:
The fraction of its energy that it radiates every second is  .
.
Explanation:
Suppose Electromagnetic radiation is emitted by accelerating charges. The rate at which energy is emitted from an accelerating charge that has charge q and acceleration a is given by 

Given that,
Kinetic energy = 6.2 MeV
Radius = 0.500 m
We need to calculate the acceleration
Using formula of acceleration

Put the value into the formula

Put the value into the formula


We need to calculate the rate at which it emits energy because of its acceleration is

Put the value into the formula


The energy in ev/s


We need to calculate the fraction of its energy that it radiates every second


Hence, The fraction of its energy that it radiates every second is  .
.