PHYSICS – General Wave Properties. LEARNING OBJECTIVES Core Demonstrate understanding that waves transfer energy without transferring matter Describe.

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Presentation transcript:

PHYSICS – General Wave Properties

LEARNING OBJECTIVES Core Demonstrate understanding that waves transfer energy without transferring matter Describe what is meant by wave motion as illustrated by vibration in ropes and springs and by experiments using water waves Use the term wavefront Give the meaning of speed, frequency, wavelength and amplitude Distinguish between transverse and longitudinal waves and give suitable examples Describe how waves can undergo: – reflection at a plane surface – refraction due to a change of speed – diffraction through a narrow gap Describe the use of water waves to demonstrate reflection, refraction and diffraction Supplement Recall and use the equation v = f λ Describe how wavelength and gap size affects diffraction through a gap Describe how wavelength affects diffraction at an edge

Waves

When a stone is dropped into a pond, ripples begin to spread out across the surface.

Waves The tiny waves carry energy – but there is no actual flow of water across the pond.

Waves Waves are just the up and down movement in water. Peak Trough

Waves Waves are just the up and down movement in water. Peak Trough There are other sorts of waves, such as: Sound Radio Light

Waves Waves are just the up and down movement in water. Peak Trough There are other sorts of waves, such as: Sound Radio Light Waves have features in common, and can be divided into two main types: 1.Transverse 2.Longitudinal

Transverse Waves Eg. light, ultra-violet, gamma rays, radio.

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The to-and-fro movements of the wave are called oscillations. In a transverse wave these oscillations are at right angles to the direction in which the energy is travelling.

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The to-and-fro movements of the wave are called oscillations. In a transverse wave these oscillations are at right angles to the direction in which the energy is travelling.

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. Features of transverse waves 1. Wavelength. The distance between any two corresponding points on the wave. (metres)

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. Features of transverse waves 1. Wavelength. The distance between any two corresponding points on the wave. (metres) 2. Amplitude. The maximum displacement of the wave from its rest point.

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. Features of transverse waves 1. Wavelength. The distance between any two corresponding points on the wave. (metres) 2. Amplitude. The maximum displacement of the wave from its rest point. 3. Speed. The speed of the wave is measured in metres per second (m/s).

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. Features of transverse waves 4.Frequency. The number of waves passing any point in one second. The unit of frequency is the hertz (Hz). One hertz is one vibration of the wave per second. The time for one oscillation is called the period.

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. Features of transverse waves 4.Frequency. The number of waves passing any point in one second. The unit of frequency is the hertz (Hz). One hertz is one vibration of the wave per second. The time for one oscillation is called the period. For example, if five complete waves pass a given point in one second (i.e. five complete oscillations) then the frequency is 5 Hz.

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. Features of transverse waves Remember! The frequency (in Hz) is the number of oscillations per second. The period (in seconds) is the time for one complete oscillation. Frequency = 1 period

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The wave equation Linking together speed, frequency and wavelength.

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The wave equation Linking together speed, frequency and wavelength. Speed = frequency x wavelength

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The wave equation Linking together speed, frequency and wavelength. Speed = frequency x wavelength v = f λ (λ = Greek letter lambda)

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The wave equation Linking together speed, frequency and wavelength. Speed = frequency x wavelength v = f λ (λ = Greek letter lambda) m/s Hz m

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The wave equation Linking together speed, frequency and wavelength. Example 1: a wave has a wavelength of 12m. Calculate the wave speed if it has a frequency of 20 Hz. v = f λ v = 20 x 12 v = 240 m/s

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The wave equation Linking together speed, frequency and wavelength. Example 1: a wave has a wavelength of 12m. Calculate the wave speed if it has a frequency of 20 Hz. v = f λ v = 20 x 12 v = 240 m/s Example 2: a wave has a frequency of 10 Hz. Calculate the wavelength if it has a wave speed of 50 m/s. v = f λ λ = v / f λ = 50 / 10 λ = 5 m

Transverse Waves Eg. light, ultra-violet, gamma rays, radio. The wave equation Linking together speed, frequency and wavelength. Example 1: a wave has a wavelength of 12m. Calculate the wave speed if it has a frequency of 20 Hz. v = f λ v = 20 x 12 v = 240 m/s Example 2: a wave has a frequency of 10 Hz. Calculate the wavelength if it has a wave speed of 50 m/s. v = f λ λ = v / f λ = 50 / 10 λ = 5 m v f λ

Longitudinal Waves Eg. Sound

Longitudinal Waves Eg. Sound CompressionRarefaction

Longitudinal Waves Eg. Sound CompressionRarefaction In longitudinal waves the oscillations (vibrations) are backwards and forwards. The different sections are known as compressions and rarefactions.

Longitudinal Waves Eg. Sound CompressionRarefaction In longitudinal waves the oscillations (vibrations) are backwards and forwards. The different sections are known as compressions and rarefactions. The oscillations in longitudinal waves are in the direction of travel. Sound waves are longitudinal waves.

Looking at Waves We can study the properties of waves by using a ripple tank.

Looking at Waves We can study the properties of waves by using a ripple tank.

Looking at Waves We can study the properties of waves by using a ripple tank. Paddle vibrates to produce waves. A ripple tank produces water waves that can be reflected, refracted and diffracted. wavefronts

Looking at Waves We can study the properties of waves by using a ripple tank. If a plain barrier is put in the way then the waves are reflected.

Looking at Waves We can study the properties of waves by using a ripple tank. If a block is submerged in the tank then the waves are refracted.

Looking at Waves We can study the properties of waves by using a ripple tank. If a block is submerged in the tank then the waves are refracted. The block makes the water more shallow which slows the waves down.

Looking at Waves We can study the properties of waves by using a ripple tank. If there is a gap in the barrier then the waves will be reflected – if the gap is smaller than the wavelength of the waves.

Looking at Waves We can study the properties of waves by using a ripple tank. However, if the gap in the barrier is similar in width to the wavelength of the wave, then the wavefronts are diffracted.

Looking at Waves We can study the properties of waves by using a ripple tank. If the gap in the barrier is larger than the wavelength of the waves, then the wave will pass through unchanged apart from slight diffraction at the edges.

Looking at Waves

LEARNING OBJECTIVES Core Demonstrate understanding that waves transfer energy without transferring matter Describe what is meant by wave motion as illustrated by vibration in ropes and springs and by experiments using water waves Use the term wavefront Give the meaning of speed, frequency, wavelength and amplitude Distinguish between transverse and longitudinal waves and give suitable examples Describe how waves can undergo: – reflection at a plane surface – refraction due to a change of speed – diffraction through a narrow gap Describe the use of water waves to demonstrate reflection, refraction and diffraction Supplement Recall and use the equation v = f λ Describe how wavelength and gap size affects diffraction through a gap Describe how wavelength affects diffraction at an edge

PHYSICS – General Wave Properties