When light passes from one transparent object, this is called refraction
Answer: 
Explanation:

Multiply by t on both sides.


Now divide by I to isolate t.


Answer:
B
Explanation:
since isotopeA has bigger mass number
Answer:
Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud. When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud.
Explanation: