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Biophysics > Lecture 4 > Flashcards

Lecture 4 Flashcards

1
Q

name 4 types of energy

A

potential
kinetic
acoustic
thermal

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2
Q

what is the unit of energy

A

joules

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3
Q

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

A

10 cm

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4
Q

is there more energy in a photon or a joule

A

there is more energy in a joule

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5
Q

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

A

a very little bit of energy

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6
Q

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

A

electron volt

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7
Q

a photon is a packet of what kind of energy

A

electromagnetic energy

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8
Q

what are the measurements of power

A

watts

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9
Q

energy that is used or expended in 1 sec is called

A

power

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10
Q

how much is 1 watt

A

1 joue of energy produced or used in 1 second

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11
Q

the human brain uses how many watts of power

A

about 20 watts of power

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12
Q

the human body uses about how many watts of power

A

100 watts

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13
Q

what is irradiance

A

intensity

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14
Q

what are the units for intensity of sound

A

decibels

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15
Q

what is the definition of a watt?

A

1 joule of energy produced or used in 1 second

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16
Q

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

A

1367 watts/meter 2

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17
Q

is the effect of solar flares big or small

A

small

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18
Q

what is the spectrum for visible light

A

400-750 nm

19
Q

what are the units for intensity of solar energy

A

watts/m2

20
Q

which is worse UVB or UVA

A

uvb

21
Q

whcih is more harmlfull infrared or visible light

A

visible light

22
Q

t/f UVB helps the skin make vitamin B

A

true

23
Q

what does visible light promote

A

photosynthesis

24
Q

which photon has more impact : visible light or uv

A

uv

25
Q

what is the defintion of energy

A

ability to do work

26
Q

what is the unit of energy

A

the joule

27
Q

what is the calorie

A

a small unit of energy

28
Q

what is the electron volt

A

a verrrrrry small unit of energy

29
Q

what is the unit of power

A

watt

30
Q

what is the definition of power

A

energy that is used or expended in 1 second

31
Q

what is the defintion of intensity

A

amount of power reaching 1 square meter

32
Q

what is solar irradiance

A

power from sun reaching 1 m2

33
Q

which kind of uv radiation can break DNA strands

A

uvB

34
Q

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

A

cholesterol

35
Q

is the electron volt a big or small unit of energy

A

small

36
Q

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

A

wave length

37
Q

what is the symbol for resistance

A

ohm

38
Q

what is the unit for electric current

A

amp

39
Q

what is the definition of an amp

A

coulomb/ second

40
Q

what is the name for the unit of electric potential

A

volt

41
Q

how much does 1 coulomb equal

A

6.24*10^18

42
Q

what does volts times amps equal

A

power

43
Q

how much energy is usally given through a defibrillator

A

100-200 joules

44
Q

which has higher resistance , dry or wet hands

A

dry

Biophysics (5 decks)

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