Physics Test 4

Question 1

reflection

Answer 1

the turning or the turning back of all or a part of a beam of light as it strikes a surface.

Question 2

concave mirrors

Answer 2

curved away from the observer (inside of spoon)

Question 3

convex mirrors

Answer 3

curved toward the observer (Christmas ornament)

Question 4

real images

Answer 4

images formed by rays of light

Question 5

virtual images

Answer 5

images that only appear to the eye to be formed by rays of light

Question 6

refraction

Answer 6

the bending of light as it passes at an angle from one medium to another of different optical density

Question 7

index of refraction

Answer 7

a measure of the optical density of a material. equal to the ratio of the speed of light in a vacuum to the speed of light in the material

Question 8

converging lenses

Answer 8

bend the light passing through them to some point beyond the lens. thicker in the center than on the edges

Question 9

diverging lenses

Answer 9

bend the light passing through them so as to spread the light. thicker on the edges than in the center.

Question 10

focal length

Answer 10

the distance between the principal focus of a mirror or lens and its vertex.

Question 11

temperature

Answer 11

the quantity that indicates how warm or cold an object is relative to some standard

Question 12

heat

Answer 12

the thermal energy transferred from one thing to another due to a temperature difference

Question 13

thermodynamics

Answer 13

the study of thermal energy and its relationship with heat and work

Question 14

first law of thermodynamics

Answer 14

when heat flows to or from a system, the system gains or loses an amount of energy equal to the amount of heat transferred.

Question 15

second law of thermodynamics

Answer 15

heat never spontaneously flows from a cold substance to a hot substance

Question 16

specific heat capacity

Answer 16

the specific heat capacity of any substance is defined as the quantity of heat required to change the temperature of a unit mass of the substance by 1 degree C

Question 17

kinds of heat transfer

Answer 17

conduction, convection, and radiation

Question 18

conduction

Answer 18

the transfer of thermal energy by molecular and electron collisions within a substance

Question 19

convection

Answer 19

the transfer of thermal energy in a gas or liquid by means of currents in the heated fluid

Question 20

radiation

Answer 20

the transfer of energy by means of electromagnetic waves