s4w6 FC properties of light

Read chapter 25. do you have any questions?

explain why an electromagnetic wave in space could neither speed up or slow down.

What is the principal difference between visible light and an x ray?

Light takes longer to go through a pane of glass, which is shown by the fact that light refracts through that glass. which of the following is true

The speed of light never actually changes

wait, but....

Recall the concept of resonance frequency from two units ago, and explain it here.

How is the concept of resonance frequency of a tuning fork similar to what goes on between atoms, molecules and light?

Mechanical waves are the energy that flows through a substance or medium, such as water, air, slinkies. What is the medium that light travels through?

you have a lamp and an object and you need to create a sharp shadow on the wall. What are some ways you can make sure the shadow is sharper?

the speed of light is always 300,000 km/s. How do you know Blue light has more energy than red light?

Watch this video on why stuff can be transparent.

https://youtu.be/wDu0KMdDD1I?si=w3fLkMJzV3UrtC43

do you have any questions?

you will notice there needs to be a 9ev of energy required to jump energy levels for glass. would a solid wall have a larger energy level gap or a smaller? explain?

Water may change the average speed of light without actually changing the speed of light (yay horse physics!) but the upshot of the average speed of the light changing means that things like water and glass bend light. go get as clear a glass of water (avoid glasses with too many cut angles. Find something smooth) and put a pencil/chopstick in the water. move around looking at the pencil at the boundry between air and water. what do you see? is it always the same?

consider looking at a window into a somewhat dark room at night. can you

When light hits an object part of it is always reflected, part of it is always absorbed (and then sometimes transmitted). what would you say makes something more likely to reflect light?

last video - do you have any questions

how do you like these science asylum videos?