P7 Waves. P7 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of a wave The relationship.

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Presentation transcript:

P7 Waves

This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of a wave The relationship between frequency and period The wave equation

What is a wave? YouTube - Water bubble in Space (zero gravity) http://www.youtube.com/watch?v=xUnadiyPTks http://www.youtube.com/watch?v=B01vktb2bj4

Waves Waves can transfer energy and information without a net motion of the material through which they travel. They involve vibrations (oscillations) of some sort.

Waves Waves can transfer energy and information without a net motion of the material through which they travel. They involve vibrations (oscillations) of some sort. Can you do something very boring and traditional……… Can you copy this please?

Transverse waves The oscillations are perpendicular to the direction of energy transfer. peak Direction of energy transfer oscillation trough

Transverse waves Water ripples Light On a rope/slinky Earthquake

Longitudinal waves The oscillations are parallel to the direction of energy transfer. compression Direction of energy transfer oscillation rarefraction

Longitudianl waves compression rarefraction

Longitudinal waves Sound Slinky Earthquake

Wave measurements

Amplitude - A The maximum displacement from the mean (average) position. amplitude

Frequency - f The number of oscillations/waves in one second. Measured in Hertz. 50 Hz = 50 vibrations/waves in one second.

Wavelength - λ The length of one complete wave. wavelength

Wave speed - v The speed at which energy is transferred along the wave 330 m.s-1

v = fλ The Wave Equation v = speed (m/s) λ = wavelength (m) f = frequency (Hz) v f λ x

Some example wave equation questions A water wave has a frequency of 2Hz and a wavelength of 0.3m. How fast is it moving? A water wave travels through a pond with a speed of 1m/s and a frequency of 5Hz. What is the wavelength of the waves? The speed of sound is 330m/s (in air). When Dave hears this sound his ear vibrates 660 times a second. What was the wavelength of the sound? Purple light has a wavelength of around 6x10-7m and a frequency of 5x1014Hz. What is the speed of purple light? 0.6m/s 0.2m 0.5m 3x108m/s

Wave equation questions λ f x

Let’s try some questions! Page 125 (all the questions) and page 136 questions 1 and 4.