Radiant energy or electromagnetic energy em
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Radiant Energy or Electromagnetic Energy (EM) PowerPoint PPT Presentation


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Radiant Energy or Electromagnetic Energy (EM). All radiant energy travels at 3.0 x 10 8 m/sec in space Velocity of a wave = wavelength x frequency Visible light is just one type of EM Energy. Electromagnetic Spectrum. All of the forms of radiation given off by vibrating electric charges.

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Radiant Energy or Electromagnetic Energy (EM)

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Radiant energy or electromagnetic energy em

Radiant Energy or Electromagnetic Energy (EM)

  • All radiant energy travels at 3.0 x 108 m/sec in space

  • Velocity of a wave = wavelength x frequency

  • Visible light is just one type of EM Energy


Electromagnetic spectrum

Electromagnetic Spectrum

All of the forms of radiation given off by vibrating electric charges

Radiation comes in the form

of vibrating or “throbbing

bundles of energy” called

photons

The frequency of the vibrating

electric charges determines

which type and how much

energy will be given off


The entire e m spectrum in order from lowest to highest frequency

The entire E.M. Spectrum in order from lowest to highest frequency

  • Radio waves: AM and FM

  • Microwaves: cooking

  • Infrared: heat

  • Visible: (ROYGBV)

  • Ultraviolet: tanning

  • Xrays: medical

  • Gamma:

deadly radioactivity


Waves energy carried by rhythmic disturbances

Waves - Energy carried by rhythmic disturbances

  • Two types:

  • 1. E.M. radiation move through empty space

  • 2. Mechanical require a medium (air, water or any type of matter) for movement


Waves 2 types

Waves - 2 Types


All waves have similar properties

All waves have similar properties

  • Frequency- the number of vibrations per second or the speed of the movement of the vibrating particles

  • Amplitude – the size of the movement of the vibrating particles

  • Both are controlled by the disturbance that created the waves


Velocity of all waves v f

Velocity of all waves - v=f λ

f-frequency and λ is wavelength (distance between identical points on two consecutive waves)

Reflection- bounce off barriers in regular ways

Refraction- waves can change direction when speed changes


And the answer is

And the answer is?

J 3300 Hz

38 At 0°C sound travels through air at a speed of 330 m/s. If a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

F 0.0033 Hz

G 33 Hz

H 330 Hz

J 3300 Hz

Use the formula chart!!!

Velocity = f λ OR

330 m/s = f x 0.10 m


Transverse waves

Transverse Waves

  • In Transverse Waves particles vibrate at right angles to the direction the wave travels.

  • Ex. E. M. Waves, waves on a slinky or rope coil, ocean waves


Longitudinal or compress ional waves

Longitudinal or Compress ional Waves

Vibrating particles move back and forth along the direction of the wave velocity

Parts consist of compressions and rarefactions

Ex. Sound Waves


Sound waves are compression waves

Sound Waves are Compression Waves

Sound is produced when a compression is made.

It requires a producer and a medium to travel through.

The more elastic the object, the faster sound travels.


Sound acts like other waves

Sound acts like other waves

  • Echoes are reflected sound waves

  • Sonar uses echoes to judge distance to obstructions

  • Human hearing is 20-20,000 Hz, below 10 Hz is infrasonic, and above 20,000 Hz is ultrasonic.


Sound waves move through matter not through empty space

Sound Waves move through matter not through empty space.

32 One tuning fork is struck and placed next to an identical fork. The two forks do not touch. The second tuning fork starts to vibrate because of —

F interference

G the Doppler effect

H resonance

J standing waves

Resonance is the vibration of another object struck by a wave of the correct frequency. Since the forks are identical, the second one receives the correct frequency to begin vibrating.


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