quiz 1

Question 1

electromagnetic radiation

comprised of…

2 ways of descripting…

generated…

Answer 1

compirise of electromagnetic waves

wave/particle duality

generated when electric charge is accelerated

Question 2

various types of electromagnetic radiation

Answer 2

gamma radiation — nuclear decay

light, ultraviolet, x-rays — orbital transitions in atoms

infrared radiation –vibrational and rotational motions of molecules

radio waves –oscillating currents in antennae

Question 3

photon is emitted when…

Answer 3

…an electron in an atom or molecule drops from a higher-energy state to a lower-energy state

Question 4

photoelectric effect happens when…

Answer 4

photon of light is absorbed and an electron is emmited carrying the same amount of energy

Question 5

Thermonuclear fusion generates _______wave radiation

Answer 5

short

Question 6

earth reflects ____wavelength radiation and emits _____wavelength radiation

Answer 6

short, long

Question 7

definition of wavelength

Answer 7

distance between corresponding points on a wave. represented by greek letter lambda

Question 8

definition of frequency

Answer 8

number of oscillation cycles per unit of time

Question 9

speed of light in a vacuum

Answer 9

3.0 x 10^8 m/s

300,000,000 meters per second

Question 10

the electromagnetic wave consists of of two fluctuating fields….

Answer 10

… one electric and the other magnetic. the fields are at right angles to one another, and both are perpendicular to the the direction of travel

Question 11

Albert Einstein found that when light interacts with electons, it has a different character…

Answer 11

it behaves as thought it is composed of many individual bodies called photons, which carry particle-like properties such as energy and momentum

Question 12

when EMR interacts with matter it is is useful to describe it as discrete packets of energy or _______

Answer 12

quanta

Question 13

____________ and __________ proposed the quantum theory of EMR

Answer 13

Niels Bohr and Max Planck

Question 14

the quantum theory of EMR states that …

Answer 14

energy in transferred in discrete packets called quanta

Q = hv

where Q is the energy of a quantum measured in joules, h is the Planck constant and v is the frequency of radiation

Question 15

quantum leap (or jump)

Answer 15

electron disappears from its original orbit and reappears in its destination orbit without traversing positions in between

Question 16

If the electron leaps from its highest-energy state to the ground state…

Answer 16

it will emit a single photon of higher energy

Question 17

If electron leap to lower state is made in a series of jumps, e.g. from 4 to 2 to 1, then each jump will….

Answer 17

emit a photon of lesser energy

Question 18

the energies meitted in the two separate jumps must sum to …

Answer 18

…the energy of a singe larger jump

Question 19

the energy (e) of an electomagnetic wave or photon is defined as ..

Answer 19

e = hv

or

e = hc/ [lambda]

h is planks constant

thus e is greater at shorter wavelengths and higher frequencies