Instead of asking this question go and study 
 
        
                    
             
        
        
        
Answer:
The voltage across a semiconductor bar is 0.068 V.
Explanation:
Given that,
Current = 0.17 A
Electron concentration 
Electron mobility 
Length = 0.1 mm
Area = 500 μm²
We need to calculate the resistivity
Using formula of resistivity


Put the value into the formula


We need to calculate the resistance
Using formula of resistance



We need to calculate the voltage
Using formula of voltage

Put the value into the formula


Hence, The voltage across a semiconductor bar is 0.068 V.
 
        
             
        
        
        
Answer:
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Explanation:
 
        
             
        
        
        
Answer:
A. potential energy is 258720 Joule 
Explanation:
A.Gravitational potential energy is: PE = m × g × h 
velocity =  15.33 m/s when the car reaches the bottom of the hill. 
where, m = mass
             g = acceleration due to gravity
             h = height from the bottom of hill. 
The potential energy is : m×g×h
                                      =(2200×9.8×12) 
                                      =258720 Joule
B. at the bottom of the hill, the potential energy is converted into kinetic energy so PE at top = KE at bottom 
                     kinetic energy=  (
( )
)
where v = velocity
           m= mass 
therefore,               v=
                          or,  v=
                          or,   v=15.33 m/s
 
        
             
        
        
        
The green wavelengths are reflected, causing green to be the only color we see in certain parts of plants.
Best of luck, my man.