1140 Questions & Blanks

Question 0

Why did scientists abandon Isaac Newton’s particle theory of light in 1850?

Answer 0

Jean Foucault discovered that light travels slower in water than in air.

Question 1

Why do scientists have difficulty discovering truth?

Answer 1

They have a limited means of observing reality.

Question 2

What are light waves?

Answer 2

The regular and rapid transverse vibrations of electric and magnetic fields that spread out evenly in all directions.

Question 3

The frequency of sound is interpreted by the ear as ______

Answer 3

Pitch

Question 4

The frequency of light is interpreted by the eye as:

Answer 4

Color

Question 5

Six basic colors of the visible light spectrum

Answer 5

Red orange yellow green blue violet

Question 6

The brightness of light is measured by its __________

Answer 6

Intensity or amplitude

Question 7

The inverse square law for light intensity (brightness)

Answer 7

The intensity of light at a particular point is inversely proportional to the square of the distance of the object from the light source.

Question 8

Light must be allows to expand in a spherical shell for the inverse square law to apply.

Answer 8

.

Question 9

Four physical quantities that vary according to the inverse square law

Answer 9

The force of gravity
Brightness of light
Intensity of sound
Magnetic fields
Electrical fields

Question 10

What did William Herschel conclude about the sun?

Answer 10

It radiates invisible waves

Question 11

Infrared waves have a _______ than do visible light waves.

Answer 11

Longer wavelength

Question 12

A blacktop road that is warmer than air

Answer 12

Radiates heat efficiently

Question 13

Black dirt

Answer 13

Absorbs and radiates heat efficiently

Question 14

A blacktop road that is cooler than the air

Answer 14

Absorbs heat efficiently

Question 15

Aluminum foil

Answer 15

Absorbs and radiates heat poorly

Question 16

Microwaves, radar, UHF, VHF, FM, AM
Increasing wavelength
Decreasing frequency

Answer 16

.

Question 18

All electromagnetic waves can be _________

Answer 18

Reflected, refracted, or absorbed

Question 19

Huygen’s principle of wave motion

Answer 19

Every point on a wave is itself a source of a new wave motion of the same frequency

Question 20

What is diffraction?

Answer 20

a phenomenon in which waves spread out after they pass through a small opening and bend as they pass along the edge of an obstruction

Question 21

When water waves strike a small standing obstruction, such as a post, they:

Answer 21

bend along the edge of the obstruction

Question 22

How does diffraction affect microscopes and telescopes?

Answer 22

it limits their resolution

Question 23

What does a diffraction grating do?

Answer 23

disperses light into the colors of the spectrum

Question 24

Three advantages of diffraction gratings compared to glass prisms

Answer 24

produces greater dispersion
separate colors better
provide a uniform amount of separation from one color to the next

Question 25

What is interference?

Answer 25

the interaction of two or more waves

Question 26

Thomas Young's experiment

Answer 26

light band resulted from constructive interference of light waves dark bands resulted from destructive interference of light waves

Question 27

Poor reception can occur when radio waves reach a receiver by two routes and ______

Answer 27

come together out of phase

Question 28

Polarization occurs because light waves are ______

Answer 28

transverse

Question 29

What happens when light waves enter certain crystal formations?

Answer 29

They are either absorbed or polarized along the plane of the crystal

Question 30

To eliminate almost all light, two polarizing crystals must be aligned

Answer 30

perpendicularly to each other

Question 31

How do two European television stations broadcast two signals of the same frequency without interference

Answer 31

one broadcasts horizontally polarized waves | the other broadcast vertically polarized waves

Question 32

Lord Rayleigh

Answer 32

.

Question 33

A body that is charged with static electricity always has

Answer 33

an unequal number of electrons and protons

Question 34

The three laws of static electricity developed by Benjamin Franklin

Answer 34

Bodies charged with static electricity attract uncharged bodies. Like electric charges repel one another, unlike attract.

Question 35

What happens when a negatively charged body is connected to a ground by a conductor?

Answer 35

it becomes neutral as excess electrons flow to the ground

Question 36

Coulomb's law

Answer 36

the force acting between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them

Question 37

a coulomb is

Answer 37

the amount of charge that will produce a force of 1.0 Newton when placed 1.0 meter from a like charge

Question 38

strongest force

Answer 38

nuclear

Question 39

weakest force

Answer 39

gravitational

Question 40

the potential difference between two points of an electrical field

Answer 40

the work-per-unit charge needed to move the charge from one point to another

Question 41

What is an electrical field?

Answer 41

the region of force that surrounds a charged object.

Question 42

(q1 x q2)/r^2

Answer 42

Coulomb's law (answer in dynes when esu and cm)

Question 43

What are two ways to increase capacitance?

Answer 43

increase charge or lower voltage

Question 44

What procedure is used to make it possible to include large capacitors in electrical circuits?

Answer 44

The capacitor is made of flexible foil which is separated with waxed paper and then rolled into a cylinder

Question 45

A _______ is one whose capacitance can be changed

Answer 45

variable capacitor

Question 46

How is a variable capacitor created?

Answer 46

by holding one set of plates stationary while the other set pivots

Question 47

If a charged rod is brought near an electroscope and the leaves collapse quickly, what happens?

Answer 47

The charges cannot be identified by this information

Question 48

When a charged rod is brought near an electroscope, the leaves collapse quickly. When a rod of opposite charge is brought near, the leaves diverge farther. What is the charge of the electroscope?

Answer 48

The charge cannot be identified by this information.

Question 49

If a charged rod is brought near an electroscope and the leaves diverge farther, what happens?

Answer 49

Either both are positive or both are negative

Question 50

Explain how the Dewar flask reduces each type of heat loss to a minimum

Answer 50

A partial vacuum reduces heat transfer by conduction and convection, and the reflective silvered surface of the walls reduces heat transfer by radiation.

Question 51

Coulomb's law

Answer 51

the force of attraction between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distances separating them.

Question 52

What is the potential difference between two points of an electric field?

Answer 52

the work-per-unit charge needed to move the charge from one point to another

Question 53

The three laws of static electricity as developed by Benji

Answer 53

Bodies charged with static electricity attract uncharged bodies. Like electric charges repel each other. Unlike electric charges attract each other.

Question 54

If a charged rod is brought near an electroscope and the leaves diverge father, what happens?

Answer 54

Either both are positive or both are negative.

Question 55

What is an electric field?

Answer 55

the region of force that surrounds a charged object