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April 25 AP Physics. In: A wire loop of radius 0.50 m lies so that an external magnetic field of magnitude 0.20 T is perpendicular to the loop. The field.

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Presentation on theme: "April 25 AP Physics. In: A wire loop of radius 0.50 m lies so that an external magnetic field of magnitude 0.20 T is perpendicular to the loop. The field."— Presentation transcript:

1 April 25 AP Physics

2 In: A wire loop of radius 0.50 m lies so that an external magnetic field of magnitude 0.20 T is perpendicular to the loop. The field reverses its direction, and its magnitude changes to 0.30 T in 1.5 s. Find the magnitude of the average induced emf in the loop during this time.

3 Objective: To comprehend: Quantum physics Photons, the photoelectric effect, Compton scattering Atomic physics Atomic energy levels Wave-particle duality

4 Atomic and Nuclear physics Quantum physics Photons, the photoelectric effect, Compton scattering Atomic physics Atomic energy levels Wave-particle duality Nuclear physics: Nuclear reactions (including conservation of mass number and charge) Mass-energy equivalence

5 "There is nothing new to be discovered in physics now. All that remains is more and more precise measurement" Attributed to William Thomson, 1st Baron Kelvin 1900 http://physics.hpa.edu/physics/apphysics/sims/apb51%20Pho tons%20and%20photoelectric%20effect/5A1_pt2.swf

6 Black body radiation and Max Plancks quantum theory German physicist Founder of quantum theory Nobel prize 1918 http://physics.hpa.edu/physics/apphysics/sims/apb51%2 0Photons%20and%20photoelectric%20effect/5A1_pt3.s wf http://physics.hpa.edu/physics/apphysics/sims/apb51%2 0Photons%20and%20photoelectric%20effect/5A1_pt3.s wf

7 Photoelectric effect:

8 Einstein and the photoelectric effect German born physicist 1905 Miraculous Year Special theory of relativity Mass/energy equivalency Photoelectric effect Brownian motion Nobel prize 1921 http://physics.hpa.edu/physics/apphysics/sims/apb51%20Photons% 20and%20photoelectric%20effect/5A1_pt4.swf http://physics.hpa.edu/physics/apphysics/sims/apb51%20Photons% 20and%20photoelectric%20effect/5A1_pt4.swf http://physics.hpa.edu/physics/apphysics/sims/apb51%20Photons% 20and%20photoelectric%20effect/5A1_pt5.swf http://physics.hpa.edu/physics/apphysics/sims/apb51%20Photons% 20and%20photoelectric%20effect/5A1_pt5.swf

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10 http://physics.hpa.edu/physics/apphysics/sims/apb51%20Photons%20and%20photoelectric%20effect/5A1_pt6.swf

11 Graph for different metals

12 E = hf = pc Kmax = hf - Φ E = energy f = frequency K = kinetic energy h= Plancks constant 6.626 x 10 -34 j. s

13 Lithium has a work function of 2.30 eV. If 400- nm light is incident what is the maximum kinetic energy of the photoelectrons.

14 Arthur H. Compton American physicist Discovered the phenomena called Compton scattering. Nobel prize 1927 http://physics.hpa.edu/physics/apphysics/si ms/apb51%20Photons%20and%20photoele ctric%20effect/5A1_pt7.swf http://physics.hpa.edu/physics/apphysics/si ms/apb51%20Photons%20and%20photoele ctric%20effect/5A1_pt7.swf

15 Neils Bohr Danish Physicist Explained atomic spectra with his model of the atom Nobel prize 1922

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22 A stellar spectrum shows three absorption lines of hydrogen produced as electrons move from the n=2 state to higher energy levels (n=3, n=4, n=5) what are the wavelengths and colors of the three lines missing from the continuous spectrum?

23 Louis de Broglie French Physicist Postulated that matter can behave as a waves Nobel prize 1929

24 If a wave can be a particle, can a particle be a wave? λ=h p

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26 If the wavelength of an electron is 5.00 × 10 7 m, how fast is it moving? (b) If the electron has a speed of 1.00 × 10 7 m/s, what is its wavelength?

27 Out: Why do you think that physicists in 1900 thought they had discovered everything?


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