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April 25 AP Physics

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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.

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**Objective: To comprehend:**

Quantum physics Photons, the photoelectric effect, Compton scattering Atomic physics Atomic energy levels Wave-particle duality

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**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

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**Attributed to William Thomson, 1st Baron Kelvin 1900**

"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

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**Black body radiation and Max Planck’s quantum theory**

German physicist Founder of quantum theory Nobel prize 1918

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**Photoelectric effect:**

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**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

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**Graph for different metals**

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**E = hf = pc Kmax = hf - Φ E = energy f = frequency K = kinetic energy**

h= Planck’s constant 6.626 x j.s

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**Lithium has a work function of 2. 30 eV**

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

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**Arthur H. Compton American physicist**

Discovered the phenomena called Compton scattering. Nobel prize 1927

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**Neils Bohr Danish Physicist**

Explained atomic spectra with his model of the atom Nobel prize 1922

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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?

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**Louis de Broglie French Physicist**

Postulated that matter can behave as a waves Nobel prize 1929

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**If a wave can be a particle, can a particle be a wave?**

λ=h p

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**If the wavelength of an electron is 5**

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 × 107 m/s, what is its wavelength?

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

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