Answer:
it answer D because waste is flowing thru the air
- Frequency=v=2×10^15Hz
- Energy=E
Using planks quantum theory




Answer:
See explanation
Explanation:
1) Physical change is usually reversible, while chemical change isn't
2) Chemical change involves the change of chemical composition of matter while physical change doesn't
The answer is b because if you’re fan is blowing and you spend it the opposite way, the air will be cooler