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April 25 AP Physics

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Page 1: 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

April 25 AP Physics

Page 2: 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

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.

Page 3: 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

Objective: To comprehend: Quantum physics

Photons, the photoelectric effect, Compton scattering

Atomic physics Atomic energy levels Wave-particle

duality

Page 4: 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

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

Page 5: 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

"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%20Photons%20and%20photoelectric%20effect/5A1_pt2.swf

Page 6: 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

Black body radiation and Max Planck’s quantum theory German physicist Founder of quantum

theory Nobel prize 1918 http://physics.hpa.edu/physics/apphysics/sims/

apb51%20Photons%20and%20photoelectric%20effect/5A1_pt3.swf

Page 7: 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

Photoelectric effect:

Page 8: 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

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_pt5.swf

Page 9: 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

Page 10: 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

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

Page 11: 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

Graph for different metals

Page 12: 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

E = hf = pcKmax = hf - Φ

E = energyf = frequency

K = kinetic energyh= Planck’s constant

6.626 x 10-34 j.s

Page 13: 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

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

Page 14: 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

Arthur H. Compton American

physicist Discovered the

phenomena called Compton scattering.

Nobel prize 1927

http://physics.hpa.edu/physics/apphysics/sims/apb51%20Photons%20and%20photoelectric%20effect/5A1_pt7.swf

Page 15: 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

Neils Bohr Danish Physicist Explained atomic spectra

with his model of the atom Nobel prize 1922

Page 16: 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

Page 17: 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

Page 18: 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

Page 19: 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

Page 20: 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

Page 21: 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

Page 22: 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

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?

Page 23: 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

Louis de Broglie French Physicist Postulated that

matter can behave as a waves

Nobel prize 1929

Page 24: 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

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

λ=h

p

Page 25: 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

Page 26: 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

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?

Page 27: 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

Out:Why do you think that physicists in 1900

thought they had discovered everything?

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