A beam of electrons is incident on a gas of hydrogen atoms.a. What minimum speed must the electrons have to cause the emission of 656 nm light from the 3S 2 transition of hydrogen?b. Through what potential difference must the electrons be accelerated to have this speed?

Helium was first discovered when astronomers viewed the spectrum from the Sun and could not associate absorption lines associated with any terrestrial element. One wavelength that was strongly absorbed was 587.5 nm (1 nm = 1.0×10-9 m). What is the energy associated with this wavelength of light?   a. 1.06 eV (or 1.70×10-19 J)   b. 0.943 eV (or 1.51×10-19 J)   c. 2.11 eV (or 3.38×10-19 J)   d. 0.472 eV (or 7.57×10-20 J)

1. A system has a ground state energy of 2 eV.  The system is in an excited energy state with 10 eV of energy.  If the system transitions from the excited energy state to the ground state by emitting 1 eV photons, how many photons are emitted? a. Exactly 8 b. More than 8 c. More than 1 but less than 8 d. Exactly 1 e. There's no way to know for sure   2. In blackbody radiation, the wavelength that has the peak intensity a. Decreases as temperature increases b. Increases as temperature increases c. Doesn't change as temperature increases

An electron has de Broglie wavelength 2.78×10-10 m . Part A Determine the magnitude of the electron's momentum pe. Express your answer in kilogram meters per second to three significant figures. ▸ View Available Hint(s) VG ΑΣΦ 24 Pe 2.29 10 . Submit Previous Answers ? × Incorrect; Try Again; One attempt remaining kg. m/s

How rapidly would each of the following particles be moving if they all had the same wavelength as a photon of red light (wavelength = 750 nm)?a. An electron of mass 9.10939 x 10^-28 g?b. A proton of mas 1.67262 x 10^-24 gc. A neutron of mass 1.67493 x 10^-24 gd. An alpha particle of mass 6.64 x 10^-24 g   Please don't provide handwriting solution

A hydrogen atom ¹H with 200 eV of kinetic energy has a head-on, perfectly elastic collision with a ¹2C atom at rest. Part A Afterward, what is the kinetic energy, in eV, of ¹H? Express your answer in electron volts. KfH = Submit Part B V Kfc = ΑΣΦ Request Answer Afterward, what is the kinetic energy, in eV, of ¹2C? Express your answer in electron volts. ww ΑΣΦ ? ? eV eV

Which has the larger de Broglie wavelength, a 0.50 kg ball moving with a speed of 25 m/s or an electron traveling at 2/3 the speed of light?  The mass of an electron is 9.11 x 10-31 kg and the speed of light is 3 x 108 m/s.   Select one: a. It could be either, depending on the circumstances. b. The ball c. The electron