1143 Definitions

Question 1

deflected toward a negative charge

Answer 1

alpha particle

Question 2

deflected toward a positive charge

Answer 2

beta particle

Question 3

not deflected in an electric or magnetic field

Answer 3

gamma ray

Question 4

a high-speed electron from a CRT

Answer 4

cathode ray

Question 5

an electromagnetic wave just above ultraviolet waves

Answer 5

x-ray

Question 6

computer terminal or monitor

Answer 6

cathode ray tube

Question 7

same mass as an alpha particle

Answer 7

helium nucleus

Question 8

most common radioactive element

Answer 8

uranium

Question 9

emit charged particles and electromagnetic waves

Answer 9

radioactive elements

Question 10

same mass as a beta particle

Answer 10

electron

Question 11

Two improvements in modern x-ray tubes

Answer 11

higher vacuum

higher voltage

Question 12

penetrating power of beta particle

Answer 12

100 times that of an alpha

Question 13

discovered alpha and beta particles and gamma radiation

Answer 13

Ernest Rutherford

Question 14

developed the first cloud chamber

Answer 14

Charles Thomson Wilson

Question 15

discovered uranium

Answer 15

Martin Klaproth

Question 16

suffered severe skin burns while experimenting with radium

Answer 16

Pierre Curie

Question 17

discovered cathode rays

Answer 17

William Crookes

Question 18

invented a radiation detector that uses ionized gas

Answer 18

Hans Geiger

Question 19

investigated the basic properties of cathode rays

Answer 19

J.J. Thomson

Question 20

discovered x-rays

Answer 20

William Roentgen

Question 21

demonstrated that cosmic rays are charged

Answer 21

Arthur Compton

Question 22

discovered the radioactive nature of uranium particles

Answer 22

Henri Becquerel

Question 23

demonstrated that cosmic rays come from space

Answer 23

Robert Millikan

Question 24

A color band running from red to violet with smooth color transitions

Answer 24

a continuous spectrum

Question 25

A series of bright, narrow lines of certain colors on a dark background

Answer 25

an emission spectrum

Question 26

a quantum

Answer 26

a discrete bundle of energy

Question 27

a photon

Answer 27

a discrete bundle of light energy

Question 28

Three kinds of spectra discovered by Prof. Kirchoff and Prof. Bunsen

Answer 28

absorption continuous emission

Question 29

Physical properties of an atom are determined by

Answer 29

atomic mass

Question 30

Atomic number

Answer 30

Number of protons

Question 31

Property that distinguishes elements exactly

Answer 31

Atomic number

Question 32

Constant for speed of light in a vacuum

Answer 32

3x10^8

Question 33

Formula for increase in mass due to motion

Answer 33

M/(1-v^2/c^2)^1/2