in a state of mind that prevents normal perception, behavior, or social interaction; seriously mentally il
Answer:
<h2>
96 Joules</h2>
Explanation:
We know that efficiency is the ratio of output power by input power. i.e. Efficiency describes the quality of machine or system how good it is.
Solution,
Energy input of system = 120 J
Efficiency = 80% = 
Now,
According to definition,
Efficiency = 
Cross multiplication:

Calculate the product

Hope this helps...
Good luck on your assignment...
The answer would be C. Gamma Rays and High Frequency EM waves travel at the speed of light and are transverse waves.