Answer:
Stars emit colors of many different wavelengths, but the wavelength of light where a star's emission is concentrated is related to the star's temperature - the hotter the star, the more blue it is; the cooler the star, the more red it is
 
        
             
        
        
        
Pretty sure it's C) condensation because all of the others required heat to be added
        
                    
             
        
        
        
Answer:a=v-u/t
=23-8/3
=5m/s hope you got your answer
Explanation:
 
        
             
        
        
        
Answer:
b) 20 kJ
Explanation:
Efficiency of carnot engine = (T₁ - T₂ ) / T₁  Where T₁ is temperature of hot source  and T₂ is temperature of sink .
T₁ = 270 + 273 = 543K
T₂ = 50 + 273 = 323 K 
Putting the given values of temperatures 
efficiency = (543 - 323) / 543 
= .405 
heat input = 50 KJ 
efficiency = output work / input heat energy 
.405 = output work / 50 
output work = 20.25 KJ. 
= 20 KJ .