Light

Question 1

gravity keeps

Answer 1

keeps
planets,
moon, etc.
in orbit

Question 2

An orbit is a conic section

Answer 2

curve formed by the intersection of a plane
with a cone

Question 3

Angular momentum (L)

Answer 3

is constant

Question 4

For a body mov ing on a curv ed path,

Answer 4

𝐿 = 𝑚𝑎𝑠𝑠 × 𝑠𝑝𝑒𝑒𝑑 × 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑓𝑟𝑜𝑚 𝑐𝑒𝑛𝑡𝑒𝑟

Question 5

angular momentum other details

Answer 5

Rotating bodies spin f aster as they shrink
* A comet mov es faster as it approaches the Sun

Question 6

Measuring masses of orbiting bodies equation

Answer 6

𝑎3 = (𝑀1 + 𝑀2 ) × 𝑃2

Question 7

measuring masses of orbiting bodies equation meaning

Answer 7

P = orbital period (in y ears)
a = semimajor axis (in A.U.)
m = mass of orbiting body
(units of Sun’s mass)
M = mass of other body
(units of Sun’s mass)

Question 8

Atoms

Answer 8

the building blocks of matter

Question 9

protons

Answer 9

positiv ely charged,
f ound in nucleus

Question 10

neutrons

Answer 10

no charge, f ound
in nucleus

Question 11

electrons

Answer 11

negativ ely
charged, orbit nucleus

Question 12

Light is a form of

Answer 12

electromagnetic radiation
Charged particles emit electric and magnetic waves.
These wav es trav el through space as
electromagnetic radiation: light!

Question 13

Light is a wave

Answer 13

Crests add to
crests,
troughs add
to troughs.
constructive
interference destructive
interference
Crests and
troughs
flatten out.
Double slit
interference
pattern for light
Light is a wave
Wavelength (
l)

Question 14

An atom emits

Answer 14

a photon (li ght-w ave) w hen an
electron moves from a higher energy level to
a lower energy level

Question 15

The distance betw een successive w ave crests
(peaks) defines the ________ of a w ave

Answer 15

wavelength

Question 16

A prism disperses

Answer 16

white light
into its component wavelengths, creating a spectrum

Question 17

Wavelengths of light spectrum

Answer 17

400 – 700 nanometers (nm)
1 nm = 10–9 meters
Red Orange Y ellow Green Blue Indigo Violet
700 nm ————- 550 nm ———— 400 nm
R O Y G. B I V

Question 18

c = (upside down y)f

Answer 18

Since c is the same f or all light wav es (300,000 km/sec),
Longer
l means Smaller f

Question 19

Visible light is a f orm of
electromagnetic radiation. So are

Answer 19

ultraviolet
light
gamma
rays
X-rays
infrared
light
radio waves
microwaves

Question 20

spectrum of light

Answer 20

: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves