1. Write a letter to Grandpa explaining why we now say that light is not just a particle, and not just a wave, but in fact is both—a “wavicle”! 2. A pendulum swings to and fro every 3 s. Show that its...

1. Write a letter to Grandpa explaining why we now say that light is not just a particle, and not just a wave, but in fact is both—a “wavicle”!

2. A pendulum swings to and fro every 3 s. Show that its frequency of swing is
 Hz.