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

CT scanners do not detect details smaller than about 0.5 Is this limitation clue to the wavelength of x lays? Explain.

Why does the energy of characteristic x rays become increasingly greater for heavier atoms?

The rate at which solar wind particles enter the atmosphere is higher during the day than at night, yet the intensity of the auroral emissions remains high well after the Sun has set. Can you suggest a means by which the atmospheric molecules might be able to radiate long after the period of collisions with charged particles has ended? (Hint: How long does it take a typical atom to radiate from a normal allowed energy state? How could this time be lengthened?)