AS Physics - Physical Quantities and Units

Units 1.1 to 1.4

what do all physical quantities consist of

numerical magnitude and a unit

what is the estimated diameter of an atom

10^-10m

what is the estimated wavelength of UV light

10nm

what is the estimated height of an adult human

2m

what is the estimated distance between earth and the sun

1\.5 x 10^11m

what is the estimated mass of a hydrogen atom

10^-27kg

what is the estimated mass of an adult human

70kg

what is the estimated mass of a car

1000kg

how many seconds are in a day

90000 seconds

how many seconds in a year

3 x 10^7s

what is the estimated speed of sound in air

300ms^-1

what is the estimated power of a lightbulb

60W

what is the estimated atmospheric pressure

1x10^5 Pa

what is the value of tera

10^12

what is the value of giga

10^9

what is the value of mega

10^6

what is the value of kilo

10^3

what is the value of centi

10^-2

what is the value of milli

10^-3

what is the value of micro

10^-6

what is the value of nano

10^-9

what is the value of pico

10^-12

what is the abbreviation for Tera

T

what is the abbreviation for Giga

G

what is the abbreviation for mega

M

what is the abbreviation for kilo

k

what is the abbreviation for centi

c

what is the abbreviation for milli

m

what is the abbreviation for nano

n

what is the abbreviation for pico

p

what is a systematic error

a consistent error caused by use of faulty instruments or flaws in experimental method

what is a random error

error caused by unpredictable fluctuations in an instruments reading as a result of uncontrollable factors

what are the effects of systematic error

affects accuracy of all readings causing them to be larger or smaller than the actual value

what are the effects of random error

affects precision of measurements causing a wider spread of results about the mean value