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# P1 5.1 and 5.2 Waves and labelling

AQA Spec from 2012
by

## Jay Vik

on 14 November 2013

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#### Transcript of P1 5.1 and 5.2 Waves and labelling

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
• 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