Chemistry electromagnetic radiation LO7

What is electromagnetic radiation?

Electromagnetic radiation is energy that travels through space as oscillating electric and magnetic fields.

types of electromagnetic radiation

• Radio waves

• Microwaves

• Infrared radiation

• Visible light

• Ultraviolet radiation

• X-rays

• Gamma rays

What is wavelength λ?

is the distance from one point on a wave to the identical point on the next wave.

What is frequency? v

Frequency is the number of complete waves that pass a point per second.

what is amplitude ?

the height of a wave.

What is the relationship between wavelength and frequency?

are inversely related.

What is the electromagnetic spectrum?

The electromagnetic spectrum is the complete range of electromagnetic radiation.

relationship between long wavelength?

Long wavelength = low frequency = low energy

relationship between short wavelength?

Short wavelength = high frequency = high energy

Relationship of frequency and light

• Frequency determines the type/color of light

Red

• Longer wavelength

• Lower frequency

• Lower energy

Violet

• Shorter wavelength

• Higher frequency

• Higher energy

equation for the speed of light

c = λν

solving for wavelength

λ = c/ν

solving for frequency

ν = c/λ light divided by wavelength

what is constructive interference ?

The waves line up and add together.- produces a bright area

what is destructive interference?

the waves cancel each other out.

→ produces a dark area

what does the double slit experiment tell us about light?

Electromagnetic radiation (light) is a wave.

what happens in the double slit experiment?

instead of seeing just two bright lines from the two slits, you get an alternating pattern of dark, light parts. -

what is the alternating pattern of dark and light parts called.

interference pattern

evidence that electromagnetic radiation is a wave.

Because diffraction and interference are behaviors of waves.

If light produces an interference pattern after passing through two slits, that is evidence that light behaves like a wave.

What would happen if light wasn’t a wave?

If light did not behave like a wave, you would expect light from each slit to simply travel toward the wall. Two bright areas.

what is diffraction?

waves spread out when they pass through a narrow opening.

What determines the energy of waves?

the amplitude