Chapter 2

Question 1

light

Answer 1

• light is electromagnetic radiation (oscillating electric and magnetic fields)
• einstein called this photons=packets of energy (quantized)
• photons (light) can be described in terms of wavelength and frequency

Question 2

amplitude

Answer 2

-peak height relates how bright the light is

Question 3

frequency

Answer 3

how many cycles pass by every second

Question 4

large wavelength

Answer 4

small frequency

Question 5

small wavelength

Answer 5

large frequency

Question 6

speed of light

Answer 6

c=3.00x10^8m/sec

Question 7

electromagnetic spectrum

Answer 7

made up of many different types of radiation; however, we can only see the visible type that consists of ROYGBIV

Question 8

energy

Answer 8

• energy of light increases with increasing frequency (photon)
• energy of light decreases with increasing wavelength (photon)

Question 9

planck’s constant

Answer 9

h=6.626x10^-34
-all energies of light using the above equations result in an energy in terms of J/particle or J/photon (avogadro’s #=J/mol photons)

Question 10

photoelectric effect

Answer 10

if the proper frequency (or wavelength) of light is shined on a metal, the light can cause the loss (ejection) of electrons from the metal

Question 11

threshold frequency (threshold wavelength)

Answer 11

frequency (or wavelength) of light needed to cause the electrons to be lost

Question 12

binding energy

Answer 12

• the energy that holds the electron to the nucleus
• energy that keeps the electron bound to the nucleus, the threshold frequency has to have enough energy to cause the electron to be ejected–>to binding E

Question 13

DeBroglie wavelength

Answer 13

relates to the velocity of a particle to wavelength

MASS IS IN KG

Question 14

heisenberg uncertainty principle

Answer 14

velocity=wave nature
position=particle nature
-if you are certain about one of these you are completely uncertain about the other
-YOU CANNOT BE CERTAIN ABOUT BOTH SIMULTANEOUSLY
-MASS IN KG