Here is my step-by-step-work. Let me know if you have any questions! :)
Answer
2) 1.5×10-2 m
Explanation
The potential difference is related to the electric field by:
(1)
where
is the potential difference
E is the electric field
d is the distance
We want to know the distance the detectors have to be placed in order to achieve an electric field of

when connected to a battery with potential difference

Solving the equation (1) for d, we find

Answer:
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Explanation:
Light waves travel in straight lines when they are travelling in a uniform medium. This is because the waves are travelling at the same speed.