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Grade 10/Science/SNC2DZ/Unit 3: Physics Homework.md

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+## Pg 469 Question number 2-4, 6-8
+
+### 2. What two major properties did maxwell predict that electromagnetic waves would possess?
+- Electromagnetic waves has electric properties (interacts with electrons) and also magnetic properties (interacts with magnetic waves such as those produced by magnetics).
+
+### 3. What two discoveries confirmed the existence of electromagnetic waves?
+- when Heinrich Hertz discovered low-energy electromagnetic waves that we call now radio waves
+- Another german scientist discovered high-energy electromagnetic waves that we call now X-rays
+
+### 4. Write these electromagnetic waves in order from lowest energy to highest energy : infrared light, X-rays, red light, gamma rays, and microwaves
+- microwaves, infrared light, red light, X-rays, gamma rays
+
+### 6. List the seven colours that newton identified in the visible specturm of white light
+- Red, Orange, Yellow, Green, Blue, Violet? (Indigo not real?)
+
+### 7. Why is it useful to examine the universe uinsg parts of the electromagnetic spectrum other than visible light?
+- Certain celestial objects give off different electromanetic waves on the spectrum (blackholes and supernovaes release gamma rays), and helps us complete a better picture of the universe. 
+
+### 8. List some devices that you have used or plan to use today that invovle electromagnetic waves
+- A phone -> uses radio waves to communicate between another phone
+- Microwave -> uses microwaves to to heat up things such as food
+
+
+## Pg 476, Question numbers 2,3,6,8,9,10
+
+### 2.Why is an incandescent bulb a very inefficient light source?
+- A incadescent bulb passes electrictiy through a filament and produces light from heat, however, most of the heat convert into infrared light instead of visible light, making this light bulb very inefficient. 
+
+### 3. Name the process of producing light by passing an electric current through a gas
+- Electric Discharge
+
+### 6. Predict whether or not a fluorescent material would glow if it was illuminated by infrared light
+- Since flourescent material absorb **ultraviolet light** and reflects it as visible light, therefore it would not glow if it absorbed infrared light, because ultraviolet light has a different wave length than infrared light.
+
+### 8. Predict whether or not a light stick would be a good light source in a potentially explosive environment. explain your prediction
+- Would be a good source of light because there is very heat generated by the light stick of chemiluminescence, do not require an electric current and are durable because they have no moving parts (completely sealed)
+
+### 9. State several reasons why living organisms might use bioluminescence
+- To be able to see in dark habitats or enviornment
+- To bait prey such
+
+### 10. What are two differences between LED and incandescent light bulbs
+- LED does not require a filament, does not produce much heat as by-product, and iss is more energy efficient.
+
+
+### Pg 481 Questions 1 - 5
+
+### 1. Name the two parts that make up most mirrors and the purpose of each part
+- A silver coating that reflects light and a glass pane to protect the silver coating
+
+### 2. early explain what is meant by the term geometric optics
+- The use of light rays to determine how light behaves when it hits objects
+
+### 3. Classify each of these materials as transparent, translucent or opaque:
+
+|Object|Transparent?|Translucent?|Opaque?|
+|:-----|:-----------|:-----------|:------|
+|Textbook| | |Yes|
+|Frosted glass| |Yes|
+|A Single sheet of thin tissue paper| |Yes| |
+|A clean sheet of glass|Yes| | |
+|A rock| | | Yes |
+|clean air|Yes | | |
+|apple juice| |Yes | | 
+|sunglasses| | Yes | |
+
+### 4. What has historically been the main use for plane mirrors?
+- A why to check your physical appearance
+
+### 5. In your own words, clearly distinguish between the terms *normal, angle of incidence*, and *angle of reflection*
+- `normal`: an imaginary line that is perpendicular to the mirror, used to calculate the angles of incidence and reflection
+- `angle of incidence`: the angle of which the light ray hits the mirror, calculated from the normal
+- `angle of reflection`: the angle of which the light gets reflected after the incident ray hits the mirror, calculated from the normal
+
+## Pg 486 Questions 1 - 5
+
+### 2. Cleary state the two laws of Reflection
+- the angle of incidence is equal to the angle of reflection
+- the normal, angle of incidence, angle of reflection all lie in the same plane?
+
+### 3. What is the difference between specular reflection and diffuse reflection? And give examples
+- specular reflection is the reflection of smooth surfaces, where all the normals are parallel to each other, like a mirror
+- diffuse reflection is the reflection of rough surfaces, where there are multiple different normals, like a piece of paper
+
+### 4. If you were painting the walls in your classroom, would you want the walls to exhibit specular or diffuse reflection> Explain. Given your choice, should you use gloss or matte paint?
+- I would want my walls to exhibit diffuse reflection so there is no glare or intense reflection from the lights and that students can't copy or cheat on assesmsents. As such I would use matte paint.
+
+### 5. a) What would be the angle of reflection of an angle of incidence of 32
+- 32 degrees
+
+### 5. b) What would be the angle of incidence of an angle of reflection of 47
+- 47
+
+### 5. c) What would be the angle of reflection be if the incident ray was 40 from the reflecting mirror surface
+- 50, but only on plane mirrors
+
+## Pg 493 Questions 1 - 7
+
+
+