Reflection

1
Reflection

• Reflection is the change in direction of a wave
  front at an interface between two different media
  so that the wave front returns into the medium
  from which it originated

2
Refraction

• Refraction is the change in direction of a wave
  due to a change in its speed like when a wave
  passes from one medium to another.

3
Interference

• Interference is the addition (superposition) of
  two or more waves that result in a new wave
  pattern.

4
Constructive Interference

• Constructive interference is when the troughs and
  peaks of 2 waves line up to make a bigger wave.

5
Destructive Interference

• Destructive interference is when the trough of
  one wave lines up with the crest of another wave.
  
• Generally there is no or little sound when this
  happens.

6
Wave Applications

• Microwaves are used for cooking and heating food.
• Infrared waves are used in heat lamps.
• Ultraviolet waves cause sunburn/skin cancer
• X-rays are used for medical diagnoses
• Gamma Rays are used in nuclear explosions.

7
Electromagnetic Spectrum

• The electromagnetic (EM) spectrum is the range of
  all possible electromagnetic radiation. The
  electromagnetic spectrum of an object is the
  characteristic distribution of electromagnetic
  radiation from that object.

8
Radio Waves

• Radio waves are located at one end of the
  electromagnetic spectrum.
• Located near microwaves and has the longest
  wavelengths.

9
Law of Conservation of Energy

• The Law of Conservation of Energy states that
  energy cant be created nor destroyed.only
  changed from one form to another.

10
Problem

• If the velocity of the wave is 76 m/s and the
  frequency is 4. What is the wavelength?

• 76 (4)( x)
• 76 (4)(x)
• 4
• 19 x

11
Problem

• If the frequency is 4 Hz and the wavelength is 11
  m. What is the velocity?

• x ( 4)(11)
• x 44 m/s

12
Problem

• If the velocity is 60 m/s and the wavelength is
  15 m. What is the frequency?

• 60 (x)(15)
• 60 (x)(15)
• 15
• 4 x