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Chapter 29: Q2CQ (page 1061)
Give an example of a physical entity that is not quantized, in that it is continuous and may have a continuous range of values.
The Example for a physical entity that is not quantized is Time or Mass and the limits for these values can't be negative.
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Question: Violet light of wavelength \[{\rm{400 nm}}\] ejects electrons with a maximum kinetic energy of \[{\rm{0}}{\rm{.860 eV}}\] from sodium metal. What is the binding energy of electrons to sodium metal?
Suppose the velocity of an electron in an atom is known to an accuracy of 2.0 x 103 (reasonably accurate compared with orbital velocities). What is the electron鈥檚 minimum uncertainty in position, and how does this compare with the approximate 0.1 nm size of the atom?
A certain heat lamp emits 200 W of mostly IR radiation averaging 1500 nm in wavelength.
(a) What is the average photon energy in joules?
(b) How many of these photons are required to increase the temperature of a person's shoulder by 2.0oC, assuming the affected mass is 4.0 kg with a specific heat of 0.83 kcal/kgoC.
{\vphantom {{\;{\bf{kcal}}} {{\bf{kg}}^\circ {\bf{C}}}}} \right.
\kern-\nulldelimiterspace} {{\bf{kg}}^\circ {\bf{C}}}}\]. Also assume no other significant heat transfer.
(c) How long does this take?
How many x-ray photons per second are created by an x-ray tube that produces a flux of x rays having a power of \({\rm{1}}{\rm{.00 - W}}\)? Assume the average energy per photon is \({\rm{75}}{\rm{.0 - keV}}\).
(a) If the position of an electron in a membrane is measured to an accuracy of 1.00 渭m , what is the electron鈥檚 minimum uncertainty in velocity?
(b) If the electron has this velocity, what is its kinetic energy in eV?
(c) What are the implications of this energy, comparing it to typical molecular binding energies?
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