**Waves**

**Conclusion**

And one more thing...

is here

All waves transfer energy from one place to the next.

They are used to communicate and transfer information from one place to the next.

Longitudinal

What are waves?

Two types of wave

Measuring Waves

Learning Objectives:

To describe the differences between longintudinal and transverse waves.

To label key features of a wave

To define the relationship between wavelength, speed and frequency

KEY WORDS

Longitudinal Transverse

Speed Perpendicular

Parallel Electromagnetic

Ocsillate

Frequency Wavelength

Transverse

The vibratation (aka oscillations) are parallel to the direction in which the wave travels

The vibrations (aka oscillations) are perpendicular to the direction the wave travels.

e.g. Sound and mechanical waves

e.g. Electromagnetic waves

The distance from one peak to the next. OR

The distance from one trough to the next.

The distance from the equillibrium to the maximum displacement.

Frequency (Herts Hz)

The number of waves passing a fixed point in one second.

Wavelength (metres m)

The distance from one peak to the next

Wave Speed (metres per sec)

The speed of the wave

e.g. For example, a wave with a frequency of 100Hz and a wavelength of 2m travels at 100 × 2 = 200m/s.

PROGRESS CHECK

1. The distance from the crest of one wave to the crest of the next wave is called:

The amplitude

The wavelength

The frequency

2. What are the units of frequency?

m/s

s

Hz

3. Which is a correct equation?

wave speed = frequency × wavelength

wave speed = frequency + wavelength

wave speed = frequency ÷ wavelength

4. Calculate the frequency of a sound wave of speed 330 m/s and wavelength 110 m.

5. Calculate the speed of a wave that has a frequency of 5 Hz and a wavelength of 50 cm

Progress Check

Outline the key similarities and differences between transverse and longitudinal waves

KERBOODLE ANIMATION

KERBOODLE INTERACTIVE ACTIVITY

To get grade You might have:

C

• Created a model wave, labeling the wavelength and amplitude.

• Stated the difference between longitudinal and transverse waves, giving an example of each.

• Stated how the difference in frequency and amplitude affects the sound created.

• Stated the link between time period and frequency.

B

• As Grade C plus:

• Explained the difference between longitudinal and transverse waves, giving an example of each.

• Explained/demonstrated how to make longitudinal and transverse waves.

• Drawn an oscilloscope trace to show how high/low and loud/quiet sounds would differ.

• Stated the wave equation, giving one worked example.

A

• As Grade B plus:

• Stated the wave equation, giving a worked example for each variable.

A*

• Explained how a change in wavelength will change the frequency of a wave traveling at a constant speed.

Task:

Your task is to create a teaching resource to explain the properties of waves to other pupils your age.

Your resource should explain transverse and longitudinal waves, wavelength, amplitude, time period,frequencies, and the wave equation.