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Mechanical Waves
Mechanical Waves
Wave Basics
Wave Basics
Use v = f λ to calculate wavelength, time period, frequency and velocity of a wave
Reflection and Refraction
Reflection and Refraction
Describe refraction in terms of a change of speed of the waves as it enter a new medium
Use v1 / v2 = λ1 / λ2 to calculate velocity and wavelength of a wave as enter a new medium
Analysis the refraction and reflection of a pulse travelling along a stretched string
Superposition, Interference and Standing Wave
Superposition, Interference and Standing Wave
Add together two simple pulses which travel along a stretched string
Describe the nature of a standing wave
Describe the interference of two wave patterns in terms of nodal lines, antinodal lines and path difference
Diffraction
Diffraction
Describe the diffraction of waves in terms of the spreading out of waves through a gap and bending around a barrier
Describe wave interference from a two point source
Introduction to Waves
Introduction to Waves
Longitudinal and Transverse Waves
Longitudinal and Transverse Waves
6 minutes
Waves: Frequency & Wavelength
Waves: Frequency & Wavelength
5 minutes
Transverse Wave
Transverse Wave
The diagram on the right shows a wave travelling to the right and its main features.
Definitions of Wave Characteristics
Definitions of Wave Characteristics
It is a transverse wave as the vibrations of the wave are at right angles to its direction.
The amplitude A of the wave is the maximum displacement from the central axis. Its SI unit is metres (m). The larger the amplitude the more energy the wave has.
The wavelength λ (lambda) of the wave is the distance between consecutive crests (or troughs). Its SI unit is metres (m).
The period T of the wave is the time taken for the two wave to travel one wavelength. Its SI unit is seconds (s).
The frequency f of the wave is the number of wavelengths that pass by every second. Its SI unit is cycles per second or hertz (Hz). The higher the frequency the more energy the wave has.
Longitudinal Wave
Longitudinal Wave
Longitudinal waves are the waves where the displacement of the medium is in the same direction, or in opposite direction, and direction of the travel of the wave. The distance between the centers of two consecutive regions of compression or the rarefaction is defined by wavelength, λ.
Reflection and Refraction
Reflection and Refraction
Reflection
Reflection
The three things that may happen when a wave hits the boundary between two materials
How to draw ray diagrams, including the angle of incidence, the normal, and the angle of reflection
That the angle of incidence is always equal to the angle of reflection
How different boundary shapes give rise to different types of reflection
The difference between specular reflection and diffuse (or scattered) reflection
Refraction of waves
Refraction of waves
What 'refraction' means
When refraction occurs
How to draw ray diagrams for the refraction of light
The idea that during refraction, the wavelength of a wave stays constant, and it is the wave speed that changes
NCEA Level 2 Waves
NCEA Level 2 Waves
Superposition
Superposition
Learn Coach - 4:12
Diffraction
Diffraction
Learn Coach - 6:09
Interference
Interference
Learn Coach - 8:47
Optional - Spectrum of Electromagnetic Wave
Optional - Spectrum of Electromagnetic Wave
Electromagnetic Waves
Electromagnetic Waves
Radio Waves
Radio Waves
Microwaves and Infrared
Microwaves and Infrared
Visible and UV Light
Visible and UV Light
X-Rays and Gamma Rays
X-Rays and Gamma Rays
Understanding Electromagnetic Radiation!
Understanding Electromagnetic Radiation!
7 minutes
Optional - Technology Links
Optional - Technology Links
How does Bluetooth Work?
How does Bluetooth Work?
Branch Education (21:34)
How do Wireless Earbuds Work?
How do Wireless Earbuds Work?
Branch Education (17:40)
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