The amount of heat needed to raise the temperature of a substance by 

 is given by

where
m is the mass of the substance
Cs is its specific heat capacity

 is the increase in temperature
For oxygen, the specific heat capacity is approximately 

The variation of temperature for the sample in our problem is 

while the mass is m=150 g, so the amount of heat needed is
 
 
        
        
        
Efficiency is completing a task as fast a possible the the least amount of effort.
        
                    
             
        
        
        
Answer:
Atomic name is your answer.
 
        
                    
             
        
        
        
Answer:
v = 10 m/s
Explanation:
recall that velocity is related to wavelength and frequency by the formula
v = fλ
where v = velocity, f = frequency and λ= wavelength
Simply substitute these into the formula:
v = fλ
v = (0.5)(20)
v = 10 m/s