Light And Lasers

Question 1

Radiation

Answer 1

Emission or propagation of light

Question 2

Unaided eye

Answer 2

Naked eye - without any kind of object

Question 3

Frequency

Answer 3

Nb of occurence of a repeating event per second

Question 4

Wavelenght

Answer 4

Distance between 2 corresponding points of a repeating signal

Question 5

Visible light

Answer 5

Portion of the electromagnetic spectrum visible to the human eye

Question 6

Application of lasers

Answer 6

Medicine : surgery -> myopia and hypermyopia
Measurement : long distances
Industry
Cutting pieces : precise and powerful

Question 7

Speed

Answer 7

Displacement per unit of time : scalar quantity

Question 8

Velocity

Answer 8

Displacement in a given direction : vector

Question 9

Treble

Answer 9

High

Question 10

Bass

Answer 10

Low

Question 11

Types of waves

Answer 11

Electromagnetic : light

Mechanical : sound

Question 12

Translucent

Answer 12

Light can pass through but impossible to identify objects

Question 13

Types of waves

Answer 13

Transverse vs longitudinal

Question 14

Relation between frequency and wavelenght

Answer 14

f = c/lambda

Question 15

LASER

Answer 15

Light Amplification by Stimulated Emission of Radiation

Question 16

Laser =

Answer 16

Device that emits light coherently, temporally and spacially

Question 17

Coherent

Answer 17

All the rays are in phase

Question 18

Unidirectional

Answer 18

Propagates only in 1 direction as a tight beam of light

Question 19

Monochromatic

Answer 19

Only 1 color = 1 frequency

Question 20

Dispositif experimental

Answer 20

Experimental set up

Question 21

________

O |________

Answer 21

TO the left

Question 22

_________
| ●
|_________

Answer 22

ON the left