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Physics - Quantum - Problems with Solutions and Tutorials

quantum
How much energy (in eV) does a photon of light with 450nm have?

Answer: E = 2.757082907783466 eV

Solver Input: E=?eV,lambda=450nm

Tutorial video:
quantum
The work function of a material is 3eV. What wavelength of light is needed to eject an electron from this material? What wavelength is needed to eject an electron with a velocity of 1e7 miles per hour?

Answer: 414 nm for ejection, 21 nm for 1e7 mi/h ejection

Solver Input: work_function=3eV,wavelength=?nm,v=1e7mi/h,m=1emass

Tutorial video:
quantum
What is the de Broglie wavelength of a 150 pound man running at 7 meters per second?

Answer: lambda = 1.3912218565116191e-36 m

Solver Input: lambda=?,m=150lb,v=7m/s

Tutorial video:
quantum
What is the energy of the helium n=1 state? How about n=2? How about n=infinity

Answer: -54eV at n=1, -13.6 at n=2, 0 at infinity

Solver Input: E=?eV,Z=2,n=1

Tutorial video:
quantum
What wavelength of light is released when an electron drops from n=2 to n=1 in a helium atom?

Answer: lambda = -30.45 nm

Solver Input: lambda=?nm,ni=2,nf=1,Z=2

Tutorial video:
quantum
What is the wavelength and energy of an emission from the Balmer series at n=5 for the hydrogen atom?

Answer: lambda = 434nm, E = 2.86eV

Solver Input: lambda=?nm,E=?eV,Balmer,n=5

Tutorial video:
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