An electron is confined in a harmonic oscillator potential well. A photon is emitted when the electron undergoes a 3?1 quantum jump
What is the wavelength of the emission if the net force on the electron behaves as though it has a spring constant of 9.6 N/m? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s)
A) 290 nm
B) 150 nm
C) 190 nm
D) 580 nm
A
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a. half a percent of the mass of the disk b. five percent of the mass of the central bulge c. half a percent of the mass of the central bulge d. five percent of the mass of the disk e. half a percent of the dark matter in the corona
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero. B) the same as before. C) small, but noticeable.
Free protons and neutrons are spewed throughout the atmosphere by
A) nitrogen decay. B) carbon decay. C) the bombardment of cosmic rays upon atoms. D) all of the above E) none of the above
An electric motor draws a current of 2.60 A from a 18.0-V battery when it runs at normal speed. If the motor's armature is "jammed" so that it cannot rotate, the current suddenly rises to 10.0 A. What is the back emf of the motor when running at normal speed?
a. 4.68 V b. 10.0 V c. 22.7 V d. 13.3 V e. 133 V