Light And Matter

Question 0

Which is more important joules rate

Answer 0

Rate

Question 1

The energy that light carries is

Answer 1

Radiative energy

Question 2

The rate of energy flow is called

Answer 2

Power

Question 3

WAtts are

Answer 3

Units to measure power

Question 4

1 watt=

Answer 4

I joule/s

Question 5

Red, blue, and green

Answer 5

Primary colors of vision . Colors ? Detected by cells in my eye .

Question 6

Diffraction grating

Answer 6

A DVD. A piece of plastic or glass etched with many closely spaced lines. A type of prism.

Question 7

Light can interact with matter in which 4 ways

Answer 7

RATE
Reflect
Absorb
Transmit
Emit

Question 8

your hand absorbs energy when placed near an incandescent light bulb

Answer 8

True

Question 9

Transmission

Answer 9

Some matter allows light to pass they it. Glass and air

Question 10

Light bounces off matter in one direction

Answer 10

Reflection . If it is more then it is scattering .

Question 11

The angle which light strikes the mirror is

Answer 11

Equal to the angle it is reflected

Question 12

Movie screens and pages of my book use

Answer 12

Scattering

Question 13

Transmit light

Answer 13

Transparent

Question 14

The process by which molecules escape solids.

Answer 14

Sublimation

Question 15

How is energy stored in atoms

Answer 15

Mass
Kinetic. They are moving
Electrical potential energy. Electron arrangement

Question 16

The order of light on an electromagnetic spectrum.

Small to large

Answer 16

Radio. Microwave. Infrared. Visible light. Ultraviolet.

X-rays , Gamma rays.

Question 17

What is the difference between different chemical elements

Answer 17

Number of protons

Question 18

How do light and matter mix

Answer 18

RATE
Reflection/scattering
Absorption. Hand near light bulb
Transmission some matter (air glass) allows light to pass thru transmit light.
Emission a light bulb emits visible ligjt

Question 19

An ionized gas

Answer 19

Plasma

Question 20

What breaks up molecules at very high temps

Answer 20

Molecular dissociation

Question 21

Strips electrons from atoms

Answer 21

Ionization

Question 22

When an electron moves from one energy level to another and can only occur when electron loses or gains the exact amount of energy.

Answer 22

Energy level transitions

Question 23

What are the three types of spectra

Answer 23

Continuous. Rainbow of colors
Absorption lines. Specific colors are missing from rainbow
Emission lines. Only specific colors against black background

Question 24

How does light tell us what things are made of

Answer 24

every kind of atom, molecules and ion produces an unique set of spectral lines so we can determine composition by studying their lines.

Question 25

How does light tell us about temperature of stars

Answer 25

They produce thermal radiation spectra. The most common continuous spectra.

Hotter objects produce more total radiation per unit area and emit photons with higher average energy.

Question 26

Doppler tells us

Answer 26

How fast something is moving towArd or away from us.

Spectral lines are moved to shorter (blue) wavelengths for incoming and red for objects moving away.

Question 27

Absorb light

Answer 27

Opaque. Sunglasses and clear eyeglasses are a mixture of opaque and transparent .

Question 28

A telescopes most important properties are

Answer 28

Light collecting area

Angular resolution how much detail we can see in images.

Question 29

Two basic designs of telescopes

Answer 29

Refracting : bends light through a lens

Reflecting forms image by focusing light with mirrors