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Practice Questions



This activity contains 27 questions.

Question 1.
red.jpgAt what temperature would a heated body appear red?


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Question 2.
What is the energy in eV of a microwave photon of wavelength, λ, 3 cm?


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Question 3.
What is the energy in eV of a red photon of wavelength λ = 750 nm?


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Question 4.
What is the energy in eV of a UV photon of wavelength λ = 300 nm?


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Question 5.
What is the energy in eV of a X-ray photon of wavelength λ = .3 nm?


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Question 6.
How many of the X-ray photons in Question 5 must strike a surface in one second to deliver power of 1 x 10-12 W?


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Question 7.
How many of the microwave photons in Question 2 must strike a surface in one second to deliver power of 1 x 10-12 W?


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Question 8.
What wavelength photon would produce an (average) intensity of 1 W/m2 with only one photon striking each 1 x 10-12 m2 of the surface per second?


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Question 9.
What type of radiation has the wavelength given by Question 8?


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Question 10.
metal.jpgA metal surface has a work function of 2.5 eV. What color light must hit it for electrons to be emitted?


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Question 11.
A 450 nm wavelength photon strikes the metal surface in Question 10. What is the maximum energy of the emitted electrons?


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Question 12.
What is the Compton wavelength?


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Question 13.
A 8300 eV photon Compton scatters at 0 degrees. What is the wavelength of the scattered photon?


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Question 14.
A 0.15 nm photon scatters at 90 degrees. What is the wavelength of the scattered photon?


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Question 15.
What is the energy of the scattered photon in Question 14?


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Question 16.
A gamma ray photon creates an electron-positron pair and the products have a total kinetic energy of 0.2 MeV. What was the wavelength of the photon?


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Question 17.
The positron in the above question slows down and is annihilated by an electron creating two identical photons going in opposite directions. What is the wavelength of these photons?


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Question 18.
What is the wavelength, λ, associated with a 1 gm B-B traveling at 10 m/s?


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Question 19.
What is the wavelength, λ, of an electron traveling at 2 x 106 m/s?


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Question 20.
What is the wavelength, λ, of a proton traveling at 2 x 106 m/s?


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Question 21.
What is the wavelength of a photon with the same momentum as the the proton in the previous question?


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Question 22.
What is the shortest wavelength in the Balmer series?


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Question 23.
What is the longest wavelength in the Balmer series?


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Question 24.
What is the maximum energy for the Bohr atom?


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Question 25.
How much energy in Joules does it take to excite a hydrogen atom into its first excited state?


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Question 26.
What temperature in kelvin would be needed for the random kinetic energy of hydrogen atoms to equal the answer to the previous question?


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Question 27.
What state (n = ?) would the Bohr atom be in to have a diameter of 1 mm?


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