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Physics - Section 2 (Measuring waves (Oscilloscope measures speed of sound…
Physics - Section 2
Measuring waves
Wave speed = Distance/Time
Wave speed = frequency x wavelength
Oscilloscope measures speed of sound
By attaching two signal generators you can generate sounds with a specific frequency, you can use two mics and an oscilloscope to find the wavelength
Speed of water ripples with strobe
Attach dipper to pool, dim light, put strobe on, look at shadow under
Wave basics
Waves transfer energy and info in the direction of travel
Amplitude of a wave is distance from start point to crest or trough
Wavelength is crest to crest
Frequency is how many pass a point in a second (measured in hertz)
Transverse waves have sideways vibrations
Perpendicular to the direction of travel. All EM waves
Longitudinal waves have parallel vibrations
Waves squash up and spread out, making compressions
Sound
Ultrasound
Infrasound and seismic waves
Wave behaviour at boundries
More uses of EM waves
Microwaves and infrared
Lenses
EM waves
Visible light and colour
Investigating refraction
Emitting and absorbing EM radiation
Ray diagrams
Reflection