Properties of A Wave Properties of A Wave.

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Presentation transcript:

Properties of A Wave Properties of A Wave

Wave – transfer of energy from one point to another without the transfer of matter between the two points. .

Electromagnetic Waves

Electromagnetic waves Electromagnetic waves-can travel through the vacuum of space.

Mechanical Waves Mechanical waves - disturbance in matter that carry energy from one place to another. -Requires a medium through which to travel The Medium can be solid, liquid or gas.

Drop Pebble in water- creates concentric circles that waves moves away from the pulse.

Surface Waves

Surface waves The seagull floating in the water (or water molecule) moves in a roughly circular path as the wave travels past.

Surface Waves in Earthquakes

Mechanical waves ( 2 types) Categorize the way by the way the particles move. What kind of wave is this ? Longitudinal or Transverse?

-Wave travels horizontally oscillates vertically, particles move at right angles to the motion of the wave

Mechanical Waves Longitudinal -the medium vibrate parallel to the direction of the wave

Waves Properties and Behavior

Waves repeat over a distance equal to the wavelength. wavelength  Lambda (λ) (λ)  is the distance between two consecutive crests or troughs

Crest of the wave- highest points Troughs of the wave – lowest point Distance from on crest to the next crest or trough to the next trough is a repeated length that equals the ( Wavelength)

λ = wavelength SI Unit = meter (m) Disturbance over which wave repeats. SI Unit = meter (m)

Connecting Ideas Learned about Period, Amplitude. Wavelength is the distance crest to crest. Period is how long it took to complete the cycle ( form crest to crest).

Characteristics of the wave T ( period) of a wave is the time required for one ( wavelength to pass a given potion. Frequency f = 1/ T Frequency is the inverse of T Amplitude (A) is the greatest displacement from the equilibrium A from equilibrium to crest same as A from equilibrium to the trough

In a longitudinal wave The crest = high pressure= compression The trough = low pressure = rarefaction

How do you find the velocity of a wave? If λ is the distance And T is the time What is the Velocity of the wave?

V = d/t Speed = wavelength/ Period V = λ / T V = λ f What is the SI units for the velocity of a wave?

SI units for velocity is always m/s

What determines the speed of the wave? V (speed) = determined by the properties of the material medium, through which it travels

Generally – waves travel faster in mediums that are hard or stiff Travel slower in mediums that are soft or squishy. Example Sound in air 343 m/s Sound in water 1,400 m/s ( not as compressible) Sound in solid – Steel- 5,960 m/s

Sound travels faster in warmer air WHY?

Ocean waves – speed greater in deep water then shallow water (produce surf

Speed of light in vacuum, commonly denoted c, is a universal physical constant (299792458 meters per second) C = 3.00 x 108 m/s

Am and FM modulation