Unit 7: Electromagnetic Radiation

Question 1

Wavelength

Answer 1

distance between crests

Question 2

Crests

Answer 2

highest point of an electromagnetic wave

(POINT)

Question 3

What is wavelength calculated in?

Answer 3

nm (nanometers)

nano = 10^-9

Question 4

Frequency

Answer 4

number of waves that pass a given point in some unit of time

Question 5

What units is frequency in?

Answer 5

waves/sec or Hertz (hz)

Question 6

Amplitude

Answer 6

max height of wave

Question 7

amplitude = 0

Answer 7

node

Question 8

The electromagnetic spectrum…

arranges forms of _______ from _______ to ______

Answer 8

Energy, Low, High

Question 9

The electromagnetic spectrum

Arranges _____ from _____ to ______ wavelengths.

Answer 9

Energy, Long, Short

Question 10

The electromagnetic spectrum

Shows visible light with wavelengths from 700 (___)-400 (___) nm.

Answer 10

red, purple/violet

Question 11

What color is at 700 nm?

Answer 11

red

Question 12

What color is at 400 nm?

Answer 12

purple/violet

Question 13

What color light has the lowest energy?

Answer 13

red light

Question 14

What does an atomic spectrum consist of?

Answer 14

Lines of different colors formed when light from a heated element passes through a prism.

and

Photons emitted when electrons drop from high to lower energy levels.

Question 15

What do heated metals emit?

Answer 15

electromagnetic Radiation with frequency that depend upon energy (temperature)

Question 16

How did Planck explain the behavior of heated metals?

Answer 16

assumed vibrating atoms gave rise to electromagnetic radiation

Question 17

Energy is proportional to the what of vibration?

Answer 17

frequency

Question 18

Planck’s equation

Answer 18

E = h x frequency

h = 6.62 x 10^-34 Jxs

Question 19

Photoelectric Effect

Answer 19

ejection of electrons when light strikes the surface of a metal

Question 20

What must the frequency be for the photoelectric effect to occur?

Answer 20

frequency must be high enough

Question 21

Light must act as a _______ in the photoelectric effect

Answer 21

particle (photon)

Question 22

Why does light have to act as a particle (photon) in the photoelectric effect?

Answer 22

to bump into an atom to knock out an electron

Question 23

λ

Answer 23

wavelength

Question 24

wavelength symbol

Answer 24

λ

Question 25

v

Answer 25

frequency

Question 26

frequency symbol

Answer 26

v

Question 27

As frequency increases, energy _____

Answer 27

increases

Question 28

As wavelength decreases, energy ______

Answer 28

increases

Question 29

Spectra

Answer 29

White light that passes through a prism and is separated into colors called a continuous spectrum - gives the colors of the rainbow

Question 30

How do electrons "jump" to a higher energy level?

Answer 30

an electron absorb energy

Question 31

What energy level does an electron go through if it absorbs energy?

Answer 31

it "jumps" to a higher energy level

Question 32

Excited State of an Atom

Answer 32

when an electron absorbs energy and "jumps" to a higher energy level

Question 33

What does it mean when an electron falls to a lower energy level?

Answer 33

energy is emitted

Question 34

When energy is emitted what energy level does the electron go to?

Answer 34

electron falls to a lower energy level

Question 35

Ground State of an Atom

Answer 35

when everything is in balance

Question 36

What does the emitted energy of an atom do and mean?

Answer 36

if in the visible range, it presents a color when energy is emitted, one color of a light is also emitted drops down to a lower energy level

Question 37

Light Equation 1

Answer 37

v=f x λ

Question 38

v=f x λ

Answer 38

velocity = frequency x wavelength

Question 39

Velocity

Answer 39

3x10^8 m/s

Question 40

Do you have to convert to m?

Answer 40

YES!

Question 41

What relationship does frequency and wavelength have?

Answer 41

inverse relationship

Question 42

node

Answer 42

when amplitude = 0