Neets 10 Wave Prop And Antennae

Front 1

What is the law of reflection?

Back 1

The angle of incidence is equal to the angle of reflection

Front 2

When a wave is reflected from a surface, energy is transferred. When is the transfer of energy greatest?

Back 2

When the wave is nearly parallel to the reflecting surface.

Front 3

A refracted wave occurs when a wave passes from one medium into another medium. What determines the angle of refraction?

Back 3

The angle between the normal and the path of the wave through the second medium

Front 4

_________ is the bending of the wave path when the waves meet an obstruction

Back 4

Diffraction

Front 5

The amount of diffraction depends on the _______ of the wave.

Back 5

wavelength

Front 6

The apparent change in frequency or pitch because of motion is explained by what effect?

Back 6

Doppler Effect

Front 7

The normal hearing range extends from about _____ hertz

Back 7

20 to 20,000

Front 8

Sound waves are _______ waves

Back 8

Compression

Front 9

Three basic elements for transmission and reception of sound must be present before a sound can be produced. They are?

Back 9

1. The sourse (or transmitter)
2. A medium for carrying the sound
3. The detector (or receiver)

Front 10

Sound cannot exist in ______?

Back 10

Empty space (or a vacuum).

Front 11

The material through which sound waves travel is called the __________.

Back 11

Medium

Front 12

The _______ the density of the medium, the slower sound travels through it.

Back 12

Higher

Front 13

Sound waves transmitted from a source are sometimes weak when they reach the detector. What instrument is needed to boost the weak signal?

Back 13

An amplifier

Front 14

Sound waves vary in ______ according to their frequency.

Back 14

Length

Front 15

A complete wavelength is called a ______.

Back 15

Cycle

Front 16

The distance from one point on a wave to the corresponding point on the next wave is a ______.

Back 16

Wavelength

Front 17

Sounds may be broadly classified into two general groups. They are?

Back 17

Noise and Tones

Front 18

Sound has three basic characteristics. What are they?

Back 18

1. Pitch
2. Intentity
3. Quality

Front 19

The term PITCH is used to describe the ______ of a sound.

Back 19

Frequency

Front 20

When the frequency is ____, sound waves are long; when it is ____, the waves are short.

Back 20

low; high

Front 21

The intensity of sound, at a given distance, depends upon the ______ of the waves.

Back 21

Amplitude

Front 22

Sound _____ is a measure of the sound energy of a wave.

Back 22

Intensity

Front 23

What characteristic of sound enables a person to distinguish one musical instrument from another, if they are all playing the same note?

Back 23

Quality

Front 24

What are two basic physical properties that govern the velocity of sound through the medium?

Back 24

1. Elasticity
2. Density

Front 25

______ is the ability of a strained body to recover its shape after deformation, as from a vibration or compression.

Back 25

Elasticity

Front 26

_______ of a medium or substance is the mass per unit volume of the medium or substance.

Back 26

Density

Front 27

The science of sound is called ______.

Back 27

Acoustics

Front 28

An _____ is the reflection of the original sound wave as it bounces off a distant surface.

Back 28

Echo

Front 29

________ is the multiple reflections of sound waves.

Back 29

Reverberation

Front 30

Any disturbance, man-made or natural, that causes an undesirable response or the degradation of a wave is referred to as _______.

Back 30

Interference

Front 31

The most complex sound wave that can be produced is _____.

Back 31

Noise

Front 32

If the object is a source of light energy, it is called ______.

Back 32

Luminous

Front 33

According to the view now generally accepted, light is a form of __________.

Back 33

Elctromagnectic radiation

Front 34

What are three means of producing light?

Back 34

Mechanical, electrical, and chemical.

Front 35

What is the smallest unit of radiant energy?

Back 35

A photon.

Front 36

What unit is used to measure the different wavelengths of light?

Back 36

Angstrom unit.

Front 37

The wavelength of light (in air) determines the _____ of the light.

Back 37

Color

Front 38

Substances that transmit almost all the light waves that fall upon them are said to be _________.

Back 38

Transparent

Front 39

Substances through which some light rays can pass but through which objects cannot be seen clearly because the rays are diffused are called _______.

Back 39

Translucent

Front 40

Substances that do not transmit any light rays are called ______.

Back 40

Opaque

Front 41

What are the three primary colors of light?

Back 41

Red, green and blue.

Front 42

What are the three secondary colors of light?

Back 42

Magenta, yellow and cyan.

Front 43

The velocity of light, which is the same as the velocity of other electromagnetic waves, is considered to be constant, at _________.

Back 43

186,000 miles per second

Front 44

The change of direction that occurs when a ray of light passes from one transparent substance into another of different density is called ________.

Back 44

Refraction

Front 45

The apparent bending of a spoon when it is immersed in a cup of water is an example of what?

Back 45

Refraction

Front 46

When light strikes a piece of white paper, the light is reflected in all directions. What do we call this scattering of light?

Back 46

Diffusion

Front 47

Sound waves travel through air at the speed of approximately _______.

Back 47

1,100 feet per second

Front 48

The term ________ is used to designate the entire range of electromagnetic waves arranged in order of their frequencies.

Back 48

Spectrum

Front 49

An _______ is a conductor or a set of conductors used either to radiate electromagnetic energy into space or to collect this energy from space

Back 49

Antenna

Front 50

An electromagnetic wave consists of two primary components. They are?

Back 50

An electric field and a magnetic field.