Lecture 4

Question 1

name 4 types of energy

Answer 1

potential
kinetic
acoustic
thermal

Question 2

what is the unit of energy

Answer 2

joules

Question 3

1 joule of energy is required to raise 1 kg how far

Answer 3

10 cm

Question 4

is there more energy in a photon or a joule

Answer 4

there is more energy in a joule

Question 5

does a photon of visible light carry a lot of energy or just a little bit of energy

Answer 5

a very little bit of energy

Question 6

what is the unit that we typically use when talking about photons

Answer 6

electron volt

Question 7

a photon is a packet of what kind of energy

Answer 7

electromagnetic energy

Question 8

what are the measurements of power

Answer 8

watts

Question 9

energy that is used or expended in 1 sec is called

Answer 9

power

Question 10

how much is 1 watt

Answer 10

1 joue of energy produced or used in 1 second

Question 11

the human brain uses how many watts of power

Answer 11

about 20 watts of power

Question 12

the human body uses about how many watts of power

Answer 12

100 watts

Question 13

what is irradiance

Answer 13

intensity

Question 14

what are the units for intensity of sound

Answer 14

decibels

Question 15

what is the definition of a watt?

Answer 15

1 joule of energy produced or used in 1 second

Question 16

what is the solar irradiance at the top of the earths atmosphere

Answer 16

1367 watts/meter 2

Question 17

is the effect of solar flares big or small

Answer 17

small

Question 18

what is the spectrum for visible light

Answer 18

400-750 nm

Question 19

what are the units for intensity of solar energy

Answer 19

watts/m2

Question 20

which is worse UVB or UVA

Answer 20

uvb

Question 21

whcih is more harmlfull infrared or visible light

Answer 21

visible light

Question 22

t/f UVB helps the skin make vitamin B

Answer 22

true

Question 23

what does visible light promote

Answer 23

photosynthesis

Question 24

which photon has more impact : visible light or uv

Answer 24

uv

Question 25

what is the defintion of energy

Answer 25

ability to do work

Question 26

what is the unit of energy

Answer 26

the joule

Question 27

what is the calorie

Answer 27

a small unit of energy

Question 28

what is the electron volt

Answer 28

a verrrrrry small unit of energy

Question 29

what is the unit of power

Answer 29

watt

Question 30

what is the definition of power

Answer 30

energy that is used or expended in 1 second

Question 31

what is the defintion of intensity

Answer 31

amount of power reaching 1 square meter

Question 32

what is solar irradiance

Answer 32

power from sun reaching 1 m2

Question 33

which kind of uv radiation can break DNA strands

Answer 33

uvB

Question 34

what does UVB use to convert into vitamin D in the skin

Answer 34

cholesterol

Question 35

is the electron volt a big or small unit of energy

Answer 35

small

Question 36

a photons ......can tell us about its energy in ev

Answer 36

wave length

Question 37

what is the symbol for resistance

Answer 37

ohm

Question 38

what is the unit for electric current

Answer 38

amp

Question 39

what is the definition of an amp

Answer 39

coulomb/ second

Question 40

what is the name for the unit of electric potential

Answer 40

volt

Question 41

how much does 1 coulomb equal

Answer 41

6.24*10^18

Question 42

what does volts times amps equal

Answer 42

power

Question 43

how much energy is usally given through a defibrillator

Answer 43

100-200 joules

Question 44

which has higher resistance , dry or wet hands

Answer 44

dry