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EM Waves and Spectrum
  • John Marabiles

  • 問題数 73 • 4/30/2024

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    問題一覧

  • 1

    These waves travel through the interior of the Earth

    body waves

  • 2

    types of em waves: ✅

  • 3

    This law quantifies the emf produced in the conductor

    Faraday’s second law

  • 4

    This are compressional waves that are longitudinal in nature

    primary

  • 5

    Types of waves:

    transverse, longitudinal, mechanical, seismic, body, em, surface

  • 6

    We measure to the crest instead of the trough because then the amplitude is a positive number: ✅❌

  • 7

    A changing magnetic field creates a changing electric field: ✅❌

  • 8

    The time that it takes a complete cycle or wave oscillation to occur

    period

  • 9

    Distance between identical points on consecutive waves

    wavelength

  • 10

    It is represented by T with second (s) as the unit of measure

    period

  • 11

    He showed that waves travel at the speed of light

    Heinrich Hertz

  • 12

    It states that electric field can produce a magnetic field, and a magnetic field can produce an electric field

    circularity

  • 13

    These are waves which require medium for their propagation

    mechanical waves

  • 14

    Waves in which particles of waves moving parallel to the direction of the propagation of waves

    longitudinal waves

  • 15

    He is most commonly known for inventing frequency-modulated or FM radio in ______

    Edwin Armstrong, 1933

  • 16

    Any moving electric charge is surrounded by an electric field and a magnetic field: ✅❌

  • 17

    waves travel along the Earth's surface

    surface waves

  • 18

    Properties of em waves: ✅

  • 19

    He did the first all-electronic television broadcast only at the age of 15

    Philo T. Fansworth

  • 20

    The highest point in a wave

    crest

  • 21

    He had 700 patents in the United States and Europe that covered every aspect of science and technology

    Nikola Tesla

  • 22

    Distance between origin and crest (or trough)

    amplitude

  • 23

    It is the difference in height between the crest and the resting position

    wave amplitude of a transverse wave

  • 24

    The speed at which the wave moves through the medium

    wave speed

  • 25

    It is the maximum distance particles move from their resting positions when the medium is compressed by the wave

    wave amplitude of a longitudinal wave

  • 26

    In a longitudinal wave, particles of the medium move back and forth in the same direction as the wave: ✅❌

  • 27

    He had the first transatlantic morse code transmission from England to to Newfoundland through EM waves

    Guglielmo Marconi

  • 28

    The higher the crests are, the greater the amplitude of the wave

    crest

  • 29

    It improved the audio signal of radio by controlling the noise static caused by electrical equipment and the earth's atmosphere

    fm radio

  • 30

    It is the transfer of energy and momentum from one point of the medium to another point of the medium without actual transport of matter between two points

    wave motion

  • 31

    It is some sort of periodic displacement of an elastic medium from its normal position

    wave motion

  • 32

    This waves are those which the particles of the medium move parallel to the propagation of the wave

    longitudinal waves

  • 33

    Also called ground roll, are surface waves that travel as ripples with motions that are similar to those of waves on the surface of water

    rayleigh waves

  • 34

    characteristics of waves: ✅

  • 35

    He was the first person to solve the problem of coordinating electronically scanned television cameras and electronically scanned television receivers that produced 26 clear moving images

    Philo T. Fansworth

  • 36

    Place the fingers of your right hand along the direction of E and curl your fingers in the direction of B. Your thumb then points along direction

    hand rule

  • 37

    mechanisms of em waves: ✅

  • 38

    He was a genius whose discoveries had a pivotal role in advancing us into the modern era

    Nikola Tesla

  • 39

    It is the maximum displacement

    amplitude

  • 40

    The maximum distance that the particles of a waves medium vibrate from their rest position

    amplitude

  • 41

    fundamental properties of em waves: ✅

  • 42

    This are shear waves that are transverse in nature

    secondary

  • 43

    It is the highest point particles of the medium reach

    crest

  • 44

    This law states that magnetic field in space around an electric current is proportional to the electric current which serves as its source, just as the electric field in space is proportional to the charge which serves as its source

    Ampere’s law

  • 45

    This waves are those in which the particles of the medium move perpendicular to the direction of the propagation of the wave

    transverse waves

  • 46

    wavelength x frequency

    speed

  • 47

    Two types of particle motion result in two types of body waves:

    primary, secondary

  • 48

    These are waves that are created as a result of vibrations between an electric field and a magnetic field

    electromagnetic waves

  • 49

    This law describes the induction of emf in a conductor

    Faraday’s first law

  • 50

    The number of cycles or vibrations per unit of time

    frequency

  • 51

    In the main coil changing electric current produces av changing magnetic field. Which then creates a changing electric field in another coil producing an electric current: ✅❌

  • 52

    The number of waves produced in a given amount of time

    frequency

  • 53

    The lowest point in a wave

    trough

  • 54

    Speed of light: ✅

  • 55

    It is regarded as a flow of energy from a vibrating electric and magnetic field

    wave

  • 56

    Em waves are also referred to as

    electromagnetic radiation

  • 57

    His most notable achievements include the first audio radio transmission in 1900 The first two-way transatlantic transmission in 1900 and the first broadcast of entertainment in in 1906

    Reginald Fessenden

  • 58

    These waves have areas of compression and areas of rarefaction

    longitudinal waves

  • 59

    In _____, he transmitted recognizable electronic signals from his family home to a vertical raised antenna more than a mile away

    1895, Guglielmo Marconi

  • 60

    This law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times) the electric current enclosed in the loop

    Ampere’s law

  • 61

    It is the point half way in between a crest and a trough in the vertical direction

    equilibrium

  • 62

    He theorized that waves travel at the speed of light

    James Clerk Maxwell

  • 63

    These waves are horizontally polarized shear waves, existing only in the presence of a semi-infinite medium overlain by an upper layer of finite thickness

    love waves

  • 64

    He demonstrated the generation and detection of radio waves in ________

    Heinrich Hertz, 1887

  • 65

    In ______, he was the first to recognize that the equations of electromagnetism lead to the existence of electromagnetic waves

    1865, James Clerk Maxwell

  • 66

    The basic equations of electricity and magnetism are known as

    Maxwell’s equations

  • 67

    In ________, particles of the medium move up and down at right angles to the direction of the wave

    transverse waves

  • 68

    It is the speed which the disturbance propagates through the medium

    velocity

  • 69

    These are waves of energy that travel through Earth's layers

    seismic waves

  • 70

    the greatest physics discovery of the 19th century

    electromagnetic waves

  • 71

    It is the distance from any point on a wave to an identical point on the next wave

    wavelength

  • 72

    Number of waves that pass a point per unit time

    frequency

  • 73

    Waves in which particles move perpendicular to the direction of the propagation of waves

    transverse waves