Physics: Light - Quiz 1

Question 1

What is light?

Answer 1

💡a form of pure energy
💡has no mass
💡travels very fast (300,000km/s
💡travels in STRAIGHT lines
💡made up of electromagnetic waves
💡electrons in atoms can be excited to and jump to higher energy levels

Question 2

what is the convection, conductions, and radiation for medium?

Answer 2

convection - liquids + gases
conduction - solids
radiation - no medium required

Question 3

what are some examples of mediums?

Answer 3

convection - ocean currents
                    - air currents
conduction - electric stove
                    - element
radiation - light travelling through vacuum of outer space

Question 4

what are electromagnetic waves?

Answer 4

⤳ a wave with electrical and magnetic parts
⤳this type of wave does not require a medium
⤳travels at the speed of light (300,000 km/s)
⤳together they form a chain

Question 5

what is a medium?

Answer 5

any physical substance (air, water, dust) that acts as a carrier for the transmission of energy (example: sound travels through air particles)

Question 6

what is visible light?

Answer 6

🔆 electromagnetic waves that the human eye can detect

🔆 visible light is just a small portion of the full electromagnetic spectrum

Question 7

what are the wavelengths of light visible to the human eye?

Answer 7

700nm - 400nm

Question 8

what happens when light strikes matter?

Answer 8

the light is either absorbed, transmitted, or reflected