chapter 6

Question 1

electromagnetic radiation

Answer 1

characterised by its wavelength and frequency

Question 2

Wavelength

Answer 2

the distance between a given point on a wave and the corresponding point on the next cycle of the wave

Question 3

frequency

Answer 3

the number of waves that pass by a given point per unit time

Question 4

what happens when a metal is heated

Answer 4

when metal is heated at high temperatures electromagnetic radiation is emitted with wavelengths depending on the temperature used

Question 5

quantization

Answer 5

certain energies are accepted

Question 6

Photoelectric effect

Answer 6

electrons are emitted from the surface of a metal when light shines on it only if the frequency of the light is high enough

Question 7

describe the movement of electrons during the photoelectric effect

Answer 7

electrons move from the negative side ( anode) to the positive side( cathode)

Question 8

photons

Answer 8

packets of energy, the energy of each photon is directly proportional to the frequency of radiation defined by planks equation

Question 9

particle wave duality

Answer 9

the idea that electromagnetic radiation has particles of both wave and particle

Question 10

line emission spectrum

Answer 10

the light of exited atoms is composed of only a few wavelengths of light

Question 11

Balmer series

Answer 11

the four visible lines in the spectrum of hydrogen atoms

Question 12

describe the bohr model of the hydrogen atom

Answer 12

there are certain orbitals corresponding to specific energy levels where the laws or classic physics do not apply as long as the electron occupies one of the energy levels , the system is stable

Question 13

ground state

Answer 13

an atom with its electrons at the lowest possible energy levels

Question 14

exited state

Answer 14

an atom with its electrons at the highest possible energy levels

Question 15

how does the value of n relate to the energy of the electron

Answer 15

as the value of n increases the distance from the nucleus increases and the energy of electrons increases

Question 16

Broglie’s hypothesis

Answer 16

an electron can be described as a matter wave

Question 17

standing wave

Answer 17

only certain matter waves are possible for electrons in an atom

Question 18

heisenberg uncertainty principle

Answer 18

for a particle as small as an electron it is impossible to accurately tell both its position and energy

Question 19

probability density

Answer 19

the probability of fin finding an electron around a specific point

Question 20

nodal surface

Answer 20

a point where the probability of finding an electron is zero

Question 21

d orbitals

Answer 21

have two cone shaped nodal surfaces

Question 22

f orbitals

Answer 22

has 3 cone shaped nodal surfaces