Answer all these and i'll mark brainliest.

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

What are similarities and differences of reflection, refraction, diffraction and absorption?

Diamond will scratch quartz. true or false