Answer:
The answer an be the option A.
Explanation:
Because radioactive substances have atomic number greater than 82.
Easy ! EVERY element and every compound melts, then boils and becomes a gas, if you heat it to a high enough temperature. That includes iron, gold, water, salt, glass, almost any substance.
The centripetal force acts upon an object moving in a circle at constant speed. The centripetal force acts perpendicular to the direction of motion , the speed of object will remain constant.
Answer:
1 going from a gas to a liquid
2 longitudinal waves
3 longitudinal waves
4 transverse waves
