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3.5

- Electromagnetic radiation

Wave diagram

Electromagnetic radiation

- radiation travels in waves
- Wavelength (?) distance between 2 waves
- Measured in meters (m)
- Frequency number of waves to pass a point in 1

second. - Measured in cycles per second (1/s) (s-1) or

hertz (hz)

Electromagnetic radiation

- longer waves have low frequency
- (radio, tv)
- shorter waves have high frequency
- (UV, x-rays)

Calculating wavelength, frequency.

- c speed of light
- 3.0 x 108 m/s
- ? wavelength (m)
- v frequency (1/s)

Calculating wavelength

- What is the wavelength of electromagnetic

radiation with a frequency of 1x106 s-1 ? - Calculate the wavelength of electromagnetic

radiation with a frequency of 1x 1019 hz ?

Light

- A narrow range of electromagnetic radiation.
- Wavelengths 400 x 10 -9m ? 700 x 10 -9m
- (400 nanometers? 700 nanometers)

Determining Wavelength ?

- ? c/ v cspeed of light vfrequency ?

wavelength - Wavelength speed of light divided by the

frequency - Speed of light is 3.00 x 108 m/s

? c/? Problems

- Calculate the frequency (?) of a wave with a

wavelength (?) of - 1.5 x 10-3 m

- Calculate the wavelength(?) of a wave with a

frequency of - 4.0 x 10 5 1/s