CHAPTER 13

Question 1

QUANTUM PHYSICS

Answer 1

the branch of physics dealing with phenomena on a very small scale, often less than the size of an atom

Question 2

PHOTON

Answer 2

a quantum of electromagnetic energy

Question 3

PLANCK CONSTANT

Answer 3

6.63 x 10^-34 Js

Question 4

ELECTRON VOLT

Answer 4

the energy transferred to or from an electron when it passes through a potential difference of 1 V, 1 eV is equal to 1.60 x 10^-19 C

Question 5

PHOTOELECTRIC EFFECT

Answer 5

the emission of photoelectrons from a metal surface when electromagnetic radiation above a threshold frequency is incident on the metal

Question 6

PHOTOELECTRONS

Answer 6

electrons emitted from the surface of a metal by the photoelectric effect

Question 7

GOLD-LEAF ELECTROSCOPE

Answer 7

a device with a metallic stem and a gold leaf that can be used to measure and identify electric charge

Question 8

THRESHOLD FREQUENCY

Answer 8

the minimum frequency of the electromagnetic radiation that will cause the emission of an electron from the surface of a particular metal

Question 9

WORK FUNCTION

Answer 9

the minimum energy needed to remove a single electron from the surface of a particular metal

Question 10

WAVE-PARTICLE DUALITY

Answer 10

a theory that states that matter has both particle and wave properties and also electromagnetic radiation has wave and photon nature

Question 11

POLYCRYSTALLINE GRAPHITE

Answer 11

thin layers of graphite with regularly arranged carbon atoms in different orientations