Electromagnetic spectrum

Visible light

Visible light

λ ≈ 700 nm λ ≈ 420 nm

Ultraviolet waves

λ ≈ 700 - 420 nm

Ultraviolet waves

λ ≈ 700 - 420 nm λ ≈ 10 – 100 nm

X-rays

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

X-rays

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

Gamma rays

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

Gamma rays

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nmλ ≈ 10-12 - 10-14 m

Infrared waves

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

Infrared waves

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

λ ≈ 10-4 - 10-6 m

Microwaves

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

λ ≈ 10-4 - 10-6 m

Microwaves

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

λ ≈ 10-4 - 10-6 m

λ ≈ 10-2 - 10-3 m

Radio waves

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

λ ≈ 10-4 - 10-6 m

λ ≈ 10-2 - 10-3 m

Radio waves

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

λ ≈ 10-4 - 10-6 m

λ ≈ 10-2 - 10-3 m

λ ≈ 10-1 - 103 m

Electromagnetic spectrum

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

λ ≈ 10-4 - 10-6 m

λ ≈ 10-2 - 10-3 m

λ ≈ 10-1 - 103 m

Electromagnetic spectrum

Long Wavelength

Short Wavelength

Electromagnetic spectrum

Long Wavelength

Short Wavelength

Low Frequency

High Frequency

What do they all have in common?

λ ≈ 700 - 420 nm

λ ≈ 10 – 100 nm

λ ≈ 1 – 0.01 nm

λ ≈ 10-12 - 10-14 m

λ ≈ 10-4 - 10-6 m

λ ≈ 10-2 - 10-3 m

λ ≈ 10-1 - 103 m

What do they all have in common?

• They can travel in a vacuum• They travel at 3 x 108m.s-1 in a vacuum (the

speed of light)• They are transverse• They are electromagnetic waves (electric

and magnetic fields at right angles to each oscillating perpendicularly to the direction of energy transfer)

Mini-book

Mini-book

• One type of EM wave for each page

• Each page should contain the wavelength and frequencies

• Each page should contain uses and other interesting information (including dangers)

• Attractive to look at (and funny?)

• Homework due Friday 29th January

Mini-book

• Finish for homework.

• Due Friday 29th January