When a beam of atoms emerges from an oven at the absolute temperature T, the most probable de Broglie wavelength for a given atom is Amp h /5mkT In this expression, m is the mass of an atom, and k is Boltzmann's constant. Part A What is the most probable speed of a hydrogen atom emerging from an oven at 400 K ? Η ΜΕ ΑΣΦ 跖 0 ? Ump = Submit Request Answer km/s

At what velocity will an electron have a wavelength of 1.00 m?

(a) What is the momentum of a 0.0100-nm-wavelength photon that could detect details of an atom? (b) What is its energy in MeV?

The work function for potassium is 2.26 eV. What is the cutoff frequency when this metal is used as photoelectrode? What is the stopping potential when for the emitted electrons when this photo electrode is exposed to radiation of frequency 1200 THz?

X-rays are produced by striking a target with a beam of electrons. Prior to striking the target, the electrons are accelerated by ail electric field through a potential energy difference: U=eV, where e is the charge of an electron and V is the voltage difference. If V = 15,000 volts, what is the minimum wavelength of the emitted radiation?

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3:42 .ull 5G Done 2 of 2 John Isner holds the ATP's (Association of Tennis Professionals) official record for the fastest serve at 253 km/h. Calculate the de Broglie wavelength of a tennis ball with the standard weight of 54.6 grams. Give your answer in 1034 m (for example, if your answer is 5.6x1034 m, then enter 5.6). This should give you a good idea of why one cannot expect to observe interference affects using tennis balls rather then, for example, electrons. +)

a) What is the momentum of a 0.0080-nm wavelength photon that could detect details of an atom? x10 23 kg m/s b) Calculate its energy. MeV

Calculate the velocity (in m/s) of an electron that has a wavelength of 8.76 µm.  m/s (b) Through what voltage (in V) must the electron be accelerated to have this velocity? (Assume the electron starts at rest.)  V

Question 7