What do all of these

pictures have in common?

Sound / microwaves etc

Core Physics – Energy

L/O :- To understand what waves are and how they transfer energy

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Exam Date -

What does the Ruben’s Tube show us?

There are 2 types of wave Longitudinal Waves

The energy travels in the same direction as the

movement

Transverse Waves

The energy travels in a different direction to

the movement

Transverse waves can travel through a

vacuumWhich type of wave do you think sound

is?

Sound must be a longitudinal wave because it cannot travel

through a vacuum. Sound travels by passing vibrations through

particles (movement in the same direction as the energy)

Which type of wave do you think light is?

Light must be transverse because it travels from

the sun to the earth through space which is a

vacuum

What are the different parts of the wave called?Amplitu

de

This affects

the volume of the sound

Wavelength (m)

This affects the pitch of the sound

Frequency Hz (number of waves per second)

This affects the wavelength and pitch

Do all waves travel at the same speed?

All E-M waves obey the Wave Equation:

Wave speed (v) = frequency (f) x wavelength ()

in m/s in Hz in m

V

f

Some Calculations

b) If the same waves travels across the pond at a speed of 5m/s, what is their wavelength?c) hack wants to see what happens if he throws Jill into different ponds. Finish off his results

Pond Freq (Hz)

WL(m)

V(m/s)

A 20 0.3

B 2 7

C 5 1.2

D 0.4 5

These waves all have a wavelength of 12m. What is their velocity?a) 2Hz b) 5Hz c) 0.5Hz d) 1000Hz

These waves all have a frequency of 10Hz. Use their velocity to work out the wavelength

a) 3m/s b) 2500m/s c) 0.2m/s d) 100cm/s

Jack threw his annoying little sister Jill in the garden pond. Jill made a large splash and waves rippled across the pond. a) If it takes 2 seconds for a full wave to pass, what is the frequency?

If you were a wave, what would your

wavelength be????What about your

frequency???

Your Wavelength

could be your stride

Your Frequency would be the

number of strides per

second

So how could you work out your speed?How could you check your calculations?

Why do all of these pictures represent waves?