Answer:
Explanation:
Given that,
The half-life of Barium-139 is 
A sample contains 
nuclei.
We need to find the decay constant for this decay. The formula for half life is given by :
Put all the values,
So, the decay constant is 
.
Most likely, the light wave will be absorbed by the wall. Without any information as to the size and color of the wall, the location and size of the hole, or the location of the light wave, this is a generalized probability problem. For all of the places the light could be, it's more likely that it hits the wall than the hole (if the hole is less than 50% of the area of the wall).
The answer is very similar to the story and occasionally
Answer:
Number 1: The answer is B
Number 2: The answer is B
Number 3: The answer is C
