Cosmos ch.11

Question 1

Waves

Answer 1

A disturbance in a medium, it carries energy. Examples (water waves, light, sound)

Question 2

Quantities of Waves

Answer 2

Amplitude (AMP)- Size
Period (T)- Time of one cycle
Frequency (F)- How many cycles in a given second
Wave length (λ)- How long a wave is in space

Question 3

Speed of Waves

Answer 3

It is determined by the properties of the materials. The wave speed, frequency, and wavelength are related.

Question 4

Types of Waves

Answer 4

Transverse
Medium travels perpendicular to wave velocity

Question 5

Superposition and Interference (2 types of this)

Answer 5

When waves overlap they interfere with each other.
(1) Constructive interference.
(2) Destructive interference

Question 6

Constructive Interference

Answer 6

Increases the amplitude of a wave

Question 7

Destructive Interference

Answer 7

Decreases the amplitude of the wave

Question 8

Diffraction

Answer 8

The bending of waves around an object, shadows don’t have sharp edges because of this, light passing through a small opening interferes with itself given a diffraction pattern.

Question 9

Young’s Double Slit Experiment

Answer 9

Proved that light was a wave
Experiment was a single light behind a screen with 2 slits in it
The dark and bright fringes on the screen proved that light is a wave