Chapter 8 & 10

Question 1

The type of EM radiation that has frequency just a bit shorter than that of visible light is

Answer 1

infrared

Question 2

Which of the following is not a common use of microwaves?

Answer 2

medical imaging.

Question 3

EM waves in a vacuum travel at a speed

(A) of c.
(B) that varies with their wavelength.
(C) that varies with their intensity.
(D) of 3 * 108 m/s.

Answer 3

A and D

Question 4

a quantum of electromagnetic radiation

Answer 4

photon

Question 5

radar utilizes this

Answer 5

microwaves

Question 6

one way for an excited atom to lose energy

Answer 6

photon emission

Question 7

in the Bohr model of the atom this is quantized

Answer 7

electron energy

Question 8

tells us that particles can’t be precisely localized

Answer 8

Heisenberg uncertainty principle

Question 9

the lowest energy level in an atom

Answer 9

ground state

Question 10

causes an electron to make a transition to a higher energy level

Answer 10

photon absorption

Question 11

works with AC but not DC

Answer 11

transformer

Question 12

causes skin to tan

Answer 12

ultraviolet rays

Question 13

the highest frequency electromagnetic waves

Answer 13

gamma rays

Question 14

The type of EM radiation emitted when high speed electrons decelerate as they are smashed into a metal target is

Answer 14

x ray.

Question 15

The EM wave that has the highest frequency in this list is

Answer 15

gamma rays.

Question 16

What does “IR” stand for?

Answer 16

infrared

Question 17

The lowest frequency visible light is

Answer 17

red

Question 18

The principle of an electric generator is that

Answer 18

When a coil of wire is mechanically rotated in a magnetic field, AC electricity is produced.

Question 19

What is the de Broglie wavelength of an electron traveling 100 m/s? (The mass of an electron is 9.11 x 10-31 kg.)

Answer 19

7.28 * 10-6 m

Question 20

The type of EM radiation that has frequency just a bit longer than that of visible light is

Answer 20

ultraviolet.

Question 21

Which of the following infers that scientific knowledge has intrinsic, fundamental limitations

Answer 21

uncertainty principle.

Question 22

What is the frequency of an EM wave that has a wavelength of 1 meter?

Answer 22

3 * 108 Hz

Question 23

An atom can be excited into a higher energy state by

Answer 23

absorbing a photon.

Question 24

What’s the Big Bang?

Answer 24

the creation of the universe.

Question 25

A magnetic field is created by an electric charge if the charge is

Answer 25

moving

Question 26

The fact that a particle cannot be precisely localized is the

Answer 26

uncertainty principle.

Question 27

The wavelength in meters of an electromagnetic wave from an FM station broadcasting at 93.9 megahertz on your radio is

Answer 27

3.19

Question 28

A radio transmitter broadcasts at a frequency of 20 MHz. What is the wavelength of the electromagnetic wave in meters?

Answer 28

15

Question 29

A transformer steps up a 120 V input voltage to 600 V output. If there are 4000 turns of wire on the output coil, how many turns must there be on the input coil?

Answer 29

800

Question 30

A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because

Answer 30

the changing magnetic field induces an electric field in the wire.

Question 31

The lowest energy level in an atom is its

Answer 31

ground state.

Question 32

A transformer is designed to step down the 120V line voltage to 9V. If there are 200 turns on the input coil, how many turns should there be on the output coil?

Answer 32

15

Question 33

What is the symbol used for Planck's constant?

Answer 33

h

Question 34

An excited atom can lose energy by

Answer 34

emitting a photon.

Question 35

The type of EM waves used in radar is

Answer 35

microwave

Question 36

What does "UV" stand for?

Answer 36

ultraviolet

Question 37

A quantum of electromagnetic radiation is a

Answer 37

photon.

Question 38

What is "excluded" by the Pauli exclusion principle?

Answer 38

electrons in the same quantum state.

Question 39

The person who expounded the uncertainty principle was

Answer 39

Werner Heisenberg.

Question 40

If the speed of an electron increases, its de Broglie wavelength

Answer 40

decreases.

Question 41

The energy associated with a photon of blue light is _____ the energy associated with a photon of red light. (The frequency of red light is about 4.4 * 1014 Hz, and the frequency of blue light is about 6.4 * 1014 Hz.)

Answer 41

greater than

Question 42

What does it mean for something to be "quantized?"

Answer 42

it can have only certain discrete values.

Question 43

The highest frequency visible light is

Answer 43

violet