Physics AAMC Qpack

Question 1

The chemical behavior of an element depends on?

Answer 1

The chemical behavior of an element depends on interactions and bond formation

Question 2

An element can be identified solely by the…

Answer 2

Number of protons, also known as the atomic number

Question 3

1 Volt is equal to how many J/C?

Answer 3

1 Volt = 1 J/C

Question 4

Formula used to calculate the frequency of a light when given the wavelength

Answer 4

Frequency is equal to the speed of light divided by the wavelength

Question 5

What is the phase difference corresponding to destructive interference?

Answer 5

The phase difference corresponding to a half of a wave is 180 degrees - a half of a wave difference in phase between two waves is destructive interference

Question 6

How does wavelength relate to period?

Answer 6

There is a direct relationship between -> the wave with the shortest wavelength has the shortest period

Question 7

What is the relationship between frequency and period?

Answer 7

Frequency and period are inversely related - the higher the frequency the lower the period

Frequency = 1 / period

Question 8

Period:

Definition

Answer 8

The time it takes to complete a cycle

Question 9

Formula for determining period from frequency:

Answer 9

Period = 1/frequency

Question 10

Comparison of the frequencies of the fourth and third harmonics:

Answer 10

Harmonics are related to frequency by a whole number, you multiply or divide the frequency by the number of the harmonic to get its frequency

Question 11

What is the Dopler equation?

Answer 11

Change in wavelenght over original wavelength equals velocity (of the movement) over the speed of the electromagnetic wave (c)

Question 12

The relationship between speed change and change in wavelegth according to the Doppler effect?

Answer 12

An increase in speed causes an increase in detected wavelength

Question 13

What is the essence of the Doppler effect?

Answer 13

The increase in distance between radio wave peaks due to the jet speed causes the received wavelength to be lengthened - as the speed of an object moving away from the receiver increases the distance between adjacent peaks of transmitted waves also increases

Question 14

What is the Doppler Equation?

(In terms of frequency)

Answer 14

The frequency change depends inversely on the speed of the wave in the medium (c)

Question 15

Why are the changes from the Doppler effect greater on sound waves than electromagnetic waves?

Answer 15

The velocity of sound is smaller than the velocity of an electromagnetic wave (the c of sound is less than the c of electromagnetic waves) - so for the same relative velocity (v) the frequency and wavelength shifts are much greater for sound

Question 16

If the receiver and an object emitting a sound are moving at the same velocity what is the frequency change detected by the receiver?

Answer 16

There is no relative motion between the sound emitter and sound receiver so there is no frequency shift

Question 17

An approaching Doppler shift of light is called a..

Answer 17

When the wavelenght of an object decreases it is referred to as a blue shift, often associated with an object getting closer

Question 18

A Doppler shift when light is moving away is called…

Answer 18

A red shift - the wavelength is increasing and the frequency is decreasing

Question 19

When an object is floating what does that tell you about the relationship between the buoyant force and the weight?

Answer 19

When an object is floating it implies that the weight is balanced by the buoyant force

Question 20

Refraction

Answer 20

The bending of the path of light waves as it passes across the boundary of two media

Question 21

What causes refraction?

Answer 21

Refraction is caused by the change in speed experienced by a wave when it changes medium

Question 22

What is the normal line when talking about refraction?

Answer 22

The normal line is a line drawn perpendicular to the boundary at a point of incidence

Question 23

When is light refracted towards the normal line?

Answer 23

When a ray of light passes a boundary moving to a material where it travels slower, results in the light ray bending towards the normal line

Question 24

What happens when a light ray crosses a boundary into a material in which it travels faster?

Answer 24

If light passes across a boundary into a medium in which it travels faster the light ray will bend away from the normal line

Question 25

What is the equation of Snell’s Law?

Answer 25

refractive index of the medium x the angle of incidence = refractive index of medium x angle of refraction

Question 26

Why does melting occur at a constant temperature?

Answer 26

Melting occurs at a constant temperature because a certain amount of energy (Latent heat of fusion) is needed to convert a substance from its solid to its liquid state - the temperature of a solid will not increase until all of the solid has become liquid

Question 27

Equation to calculate the electric field when given voltage, current, resistance, and length

Answer 27

electric field = (Volts - [current x resistance]) / Length

Question 28

What effect will increasing the number of incident photons have on the electrons?

Answer 28

Change the number of incident photons affects only the number of electrons not their energies

Question 29

What effects the energy of electrons in a vacuum photodiode dector

Answer 29

The electron energies depend on the energy of the photon, the cathode work function, and the potential difference between the cathode and anode

Question 30

How is velocity of a particle effected in an electric field?

Answer 30

A charged particle accelerated in an electric field - the electron starts with a velocity that increases as it approaches the anode through the vacuum