Electricity and Magnetism
# E+M Warmups

What is causing the reversal of the colors in the glass?

Ignore electron microscopes.

Suppose the time it takes the sound to reach you is \(t_\textrm{radio}\) and the time is takes to reach your friend is \(t_\textrm{live}\). How much faster the sound reach you, compared to your friend (i.e. find \(t_\textrm{live}/t_\textrm{radio}\))?

**Details and Assumptions**:

- Take the speed of sound to be \(300 \text{ m/s}\).
- The speed of radio waves is \(300,000 \text{ km/s}\).

Note: \(g\) denotes the gravitational acceleration.

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