Bohr's quantization conditions for the allowed state of an electron in the hy- drogen atom are given by h ln=mvain= "2t where n 1,2, 3.. consider a ten-fold ionized sodium ion, na10+, which is obtained by removing ten electrons from a na atom (z = 11). (i) derive the radii (rn) and the speeds (v) of the allowed states (ii) calculate the orbiting speed and orbital angular momentum of the electron when the ion is in its third excited state (c) an experimenter determines that when a beam of monoenergetic electrons bombards a sample of a pure gas, atoms of the gas are excited if the kinetic energy of each electron in the beam is 3.82 ev or greater (i) determine the de broglie wavelength of 3.82 ev electrons (ii) once the gas is excited by 3.82ev electrons, it emits monochromatic light determine the wavelength of this light (iii) experiments reveal that two additional wavelengths are emitted if the beam energy is raised to at least 4.93 ev. construct an energy level diagram consistent with this information and determine the energies of the photons associated with those two additional wavelengths. label all three possible transitions

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.

What is the measurement of how fast an object moves relative to a reference point?

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud