CP 5 Reading Messages from the Cosmos

Question 1

Definition of energy

Answer 1

is the ability to do something (usually denoted as “work”).

Question 2

Energy is mesured in:

Answer 2

Joules

Question 3

Define power

Answer 3

Energy used or produced per time

Question 4

Power is measured in

Answer 4

Watt

Question 5

what is 1 Watt in joules

Answer 5

1 Joule per second

Question 6

How do light and matter interact

Answer 6

• Emission
• Absorption
• Transmission
  – Transparent objects transmit light.
  – Opaque objects block (absorb) light.
• Reflection/scattering

Question 7

What is light

Answer 7

Light can act either like a wave or like a
particle

Question 8

what are particles of light called

Answer 8

Particles of light are called photons

Question 9

what is a wave

Answer 9

A wave is a pattern of motion that can carry energy without carrying matter along with it

Question 10

define wavelength

Answer 10

Wavelength is the distance between two wave peaks

Question 11

define frequency

Answer 11

Frequency is the number of times per second that a wave vibrates up and down

Question 12

TF each photon has a wavelength and a frequency

Answer 12

T

Question 13

Define istope

Answer 13

Isotope: same # of protons but different # of
neutrons

Question 14

What are the 4 phase changes

Answer 14

Ionization
Dissociation
evaporation
melting

Question 15

what is ionization

Answer 15

atoms into plasma

Question 16

what is dissociation

Answer 16

molecules into atoms

Question 17

what is evaporation

Answer 17

liquid into gas

Question 18

what is melting

Answer 18

solid into liquid

Question 19

what does the phase depend on

Answer 19

temperature and pressure.

Question 20

what are the three types of spectra

Answer 20

Emmission line
continuous
absorption line

Question 21

what is continuous spectrum

Answer 21

The spectrum of a common light bulb spans all visible wavelengths (everything u can see)

Question 22

what is an emmission line spectrum

Answer 22

emits light only at specific wavelengths, producing a spectrum with bright emission lines

Question 23

what is absorption line spectrum

Answer 23

absorb light of specific wavelengths,
leaving dark absorption lines in the spectrum

Question 24

TF Each type of atom has a unique set of
energy levels

Answer 24

T

Question 25

TF Only humans emit thermal radiation

Answer 25

F (Nearly all large or dense objects emit thermal radiation, including stars, planets, you)

Question 26

TF Hotter objects emit less light per area at all frequencies

Answer 26

F Hotter objects emit more light per area at all frequencies