Unit One: Light Forces

Question 1

What are the functions of Light on Earth

there are two (2) of them

Answer 1

1. Source of Energy for all organisms
2. Source of information (navigation, time)

Question 2

What is Light

Answer 2

• electromagnetic radiation from the sun
• source of energy for nuclear reactions
• energy travels through electromagnetic waves

Question 3

What causes the delay in vision from sunlight to human eye?

Answer 3

a delay in neurotransmitters

Question 4

How long does it take for sunlight to reach organisms from the sun

Answer 4

Approx 8 minutes

Question 5

What is the distance from the sun to the earth

Answer 5

147-152 (10^6) km

Question 6

What is the common travelling speed of light

Answer 6

1.1 (10^9) km/h

Question 7

What are the two aspects to electromagnetic waves

Answer 7

1. Wavelength
2. Frequency

Question 8

If an electromagnetic wave is short, what can be said about it’s occelation?

Answer 8

Shorter Waves = QUICK occelation

Occelation: repeated motion in state (quick occelation = quicker wave)

Question 9

What are the two components of electromagnetic waves

Think composition

Answer 9

1. Oscillating Electrical Component

2. Comoving Magnetic Component

Question 10

What does the electromagnetic spectrum look like?

(from shortest high energy to longest low energy)

Answer 10

1. Gamma Rays
2. X-Rays
3. Ultraviolet Radiation
4. Near-Infrared Radiation
5. Infrared Radiation
6. Microwaves
7. Radio Waves

Question 11

What are the 3 potential situations that could occur when light hits an object?

Answer 11

1. Reflection
2. Refracted
3. Asborbed

Question 12

What is Reflection

bullet points

Answer 12

• electromagnetic waves “bounce” off object
• gives rise to visible colours
• can be reflected and bounced onto something else

Question 13

What is Refraction

bullet points

Answer 13

• light moves through an object
• rays can change angle and alter an image
• cleaning net in a swimming pool

Question 14

What is Absorption

bullet points

Answer 14

• biological organisms absorb light
• skin cells absorb light
• light energy will excite atoms