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:
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 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.
Objective: To comprehend: Quantum physics Photons, the photoelectric effect, Compton scattering Atomic physics Atomic energy levels Wave-particle duality
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
"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 tons%20and%20photoelectric%20effect/5A1_pt2.swf
Black body radiation and Max Plancks quantum theory German physicist Founder of quantum theory Nobel prize Photons%20and%20photoelectric%20effect/5A1_pt3.s wf 0Photons%20and%20photoelectric%20effect/5A1_pt3.s wf
Einstein and the photoelectric effect German born physicist 1905 Miraculous Year Special theory of relativity Mass/energy equivalency Photoelectric effect Brownian motion Nobel prize and%20photoelectric%20effect/5A1_pt4.swf 20and%20photoelectric%20effect/5A1_pt4.swf 20and%20photoelectric%20effect/5A1_pt5.swf 20and%20photoelectric%20effect/5A1_pt5.swf
Graph for different metals
E = hf = pc Kmax = hf - Φ E = energy f = frequency K = kinetic energy h= Plancks constant x j. s
Lithium has a work function of 2.30 eV. If 400- nm light is incident what is the maximum kinetic energy of the photoelectrons.
Arthur H. Compton American physicist Discovered the phenomena called Compton scattering. Nobel prize ms/apb51%20Photons%20and%20photoele ctric%20effect/5A1_pt7.swf ms/apb51%20Photons%20and%20photoele ctric%20effect/5A1_pt7.swf
Neils Bohr Danish Physicist Explained atomic spectra with his model of the atom Nobel prize 1922
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?
Louis de Broglie French Physicist Postulated that matter can behave as a waves Nobel prize 1929
If a wave can be a particle, can a particle be a wave? λ=h p
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?
Out: Why do you think that physicists in 1900 thought they had discovered everything?