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# E+M Warmups

Physics is not a discipline, but a way of looking at the world. See if you can use your sense of the world to explain everyday phenomena.

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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