1. November 22, 2013

2. Name of the Game: ENERGY And also: NOBEL PRIZES FOR PHYSICS

3. Energy, Wavelength, Frequency Long wavelength Low frequency Low energy Short wavelength High frequency High energy

4. Wave Model

5. Studied: Black body radiation Why do hot metals have a different color than cold metals? Heat is energy Color is visible light (EMR)

6. Max Planck (1918 – Nobel Prize) Quantum: – A small packet of energy – Smallest amount of energy that can be gained or lost by an atom Planck’s constant: h = 6.626 × 10 -34 J· s 1858-1917  Energy is only emitted in “small packets”

7. Albert Einstein (Nobel Prize - 1921) Studied: Photoelectric effect In the photoelectric effect, electrons are emitted from matter when atoms absorb energy from electromagnetic radiation (EMR) Below a certain frequency of light, no electrons were emitted

8. Albert Einstein (Nobel Prize - 1921) Light can behave as a wave AND a particle “Dual wave-particle” nature of light Photon: – particle of electromagnetic radiation – carries a quantum of energy – zero mass 1879-1955

9. The energy (E ) of electromagnetic radiation is directly proportional to the frequency ( ) of the radiation. E = h E = h E = Energy, in units of Joules (kg  m 2 /s 2 ) h = Planck’s constant (6.626 x 10 -34 J  s) v = frequency (Hz, s -1 )

10. PRACTICE: What is the energy in Joules of a photon with a frequency of 4.0 × 10 11 Hz? – E = hv = (6.626 x 10 -34 Js)(4.0 x 10 11 Hz) = 2.65 x 10 -22 J What is the frequency of a photon with an energy of 7.3 × 10 -18 J? – E = hv 7.3 × 10 -18 J = (6.626 x 10 -34 Js)v (7.3 × 10 -18 J)/(6.626 x 10 -34 Js) = 1.1 x 10 16 Hz

11. A few examples Gamma Radiation Infrared Ultraviolet Microwaves

12. Gamma Radiation Space! Nuclear decay More on Tuesday…

13. Infrared: Remote Control “Below red” How to see it on your camera phone: http://www.wikihow.com/See-Infared-Light http://www.wikihow.com/See-Infared-Light

14. Ultraviolet rays: The Sun Click on the link to see how this experiment worked.

15. Ultraviolet Rays: BlackLight What items will show up under a blacklight? Why do some things phosphoresce under UV light? Fluorescent substances absorb the ultraviolet light and then re-emit it almost instantaneously. Some energy gets lost in the process, so the emitted light has a longer wavelength than the absorbed radiation, which makes this light visible and causes the material to appear to 'glow'.

16. Microwave Mental Floss: Discovery of (1:50) Mental Floss Minute Physics: How it works Minute Physics

17. Your task…