Physics

Question 1

What is the difference between wavelength and frequency

Answer 1

wavelength= distance of wave in (m)
frequency= # of waves passing a point (hz)

Question 2

Name the image charactersitics for an object in a plane mirror

Answer 2

1. Upright
2. Same size
3. Virtual
4. Same distance
5. Laterally inverted

Question 3

What wavelengths are visible to the human eye

Answer 3

shorter than 400nm and higher than 700nm

Question 4

What are 2 practical uses of convex mirrors

Answer 4

1. side mirrors on vehicals: gives you a wider field of view, allows drivers to see more of he road and traffic behind them
2. security mirrors in stores: allows store ownders to see a larger area from a single point which would prevent theft

Question 5

How do you calculate the index or refraction

Answer 5

n=c/v c=3x10^8

Question 6

What is refraction

Answer 6

The bending of light as it passes through different mediums due to a change in its speed

Question 7

What would happen if an object has a higher index or refraction then the other

Answer 7

It would bend towards the normal

Question 8

What is total internal reflection (TIR), when does it happen, and why does it happen

Answer 8

• happens when light bounces back inside a material instead of passing through
• happens because it is moving from a denser to less dense material at a steep angle

Question 9

Give practical applications of refraction

Answer 9

a) lenses in glasses since refraction helps focus light
b) magnifying glasses since refraction bends light to make objects look larger and clearer

Question 10

Give practical applications of TIR.

Answer 10

a) fiber optic cables (used for internet) because TIR allows light to travel long distances through the cables without escaping\
b) endoscopes because it is used to send light through flexible tubes to help doctors see inside the body with no surgery

Question 11

What is myopia and hyperopia and what lens do you need for each

Answer 11

• myopia is near sightedness and you need a convave/ diverging lens
• hyperopia is far sightness and you need a convex/ converging lens

Question 12

What 3 lines do you draw when drawing mirror ray diagrams

Answer 12

1. Straight line to the mirror and bounces back through F
2. Passes through F and bounces back parrellel
3. Passes through C/2F

Question 13

What are the 3 equations

Answer 13

n=c/v, 1/f=1/di+1/do, m=hi/ho+-di/do

Question 14

In order give me the six invisible to visible light

Answer 14

Radiowaves, mircrowaves, infared, ultraviolet, xrays, gamma rays

Question 15

How would you know if something has a higher index of refraction

Answer 15

the angle of incidence would be greater than the angle or refraction