To be done after reading chap1.3 and 2.1
1. Before taking a bath, tap the water in your bathtub with your finger. Waves form. But there is something else about this wave. The amplitude decreases. The circles you made disappear after traveling a few centimeters. Why and how does that happen?
2. If light refracts in a new medium, why shouldn't our bodies refract as we dive in to a swimming pool? What do you think?
3. In the vaccum sound experiment(p.41) give an answer to the question, 'why do you think the bell is suspended?'
1. In the book, it explains about destructive interference, which is about two similar waves but the crest of one wave joins briefly with the trough of the other meets, the amplitude decreases. But even if the destructive interference doesn't happen, I think that waves disappear because you didn't give the water, energy. The wave was caused because you tap the water with your finger. But you didn't tap the water again and again. So the water waves didn't have the energy to transfer and the amplitude decreases and the wave stopped.
2. Refraction occurs because waves travel at different speeds in different mediums. But humans don't. Because humans don't suddenly become fast in the water, it depends on theirselves. So humans don't bend when they enter a new medium.
3. Sound waves can move only through a medium that is made up of matter. For example, sound waves can travel through such as air, liquids, solid materials because these are all made up of particles. Sound waves cannot travel through a vacuum. In the vaccum sound experiment, the sound of the bell became quieter, so the bell was suspended.