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Waves
Learning Objectives
In your groups write down as many things as you can about waves
Waves
What is the frequency?
Be able to label a diagram of a wave
Be able to use the wave equation to calculate properties of a wave
What is the amplitude?
What is the wavelength?
Waves transfer energy from one place to another.
Waves do not move matter from one place to another
Questions
Frequency
Sound is a wave. Can you describe how sound travels?
Calculate the speed of a wave which moves 1200m in 20s.
Wave Equation
Light is also a wave. Which moves faster, sound waves or light waves?
What else travels in waves?
A saxophone emits sound of wavelength 1.3m and frequency 260Hz. Calculate the waves speed.
wave speed = frequency x wavelength
Complete worksheet 1.5d
Hz
m/s
m
Frequency is measured in Hertz (Hz).
It is the number of vibrations a wave makes per second
A guitar string vibrates at a frequency of 150Hz. How many vibrations does it make in one minute?
Calculate the frequency of sound waves of wavelength 0.35m. The speed of sound is 340m/s
v = ƒ λ
Calculate the wavelength of radio waves of frequency 2x10^5 Hz. Radio waves travel at 3x10^8 m/s.
Test
Electromagnetic radiation
Seeing
What wave has the longest wavelength?
What wave has the highest frequency?
What wave is used in medical imaging?
What wave is used in mobile phones?
Our eyes can only see a small portion of electromagnetic radiation.
In order:
Radio waves, microwaves, Infra-red, visible, ultra violet, X-ray, Gamma.
How could you remember them in order. Can you write down some uses for each type of radiation?
Speed of these waves
We have cameras that can detect other parts of it though.
All these waves travel at the same speed. The speed of light.
300000000 m/s
Electromagnetic Spectrum
Herschel and Ritter
Discovered light that is invisible to us with less energy than red light and more energy than violet light.
Learning Objectives
Describe electromagnetic waves and the electromagnetic spectrum (C)
Explain what Herschel and ritter discovered (B)
Explain how properties of the waves change as you move across the spectrum (B)