Cracking the SAT Physics Subject Test
throughout its volume, but was concentrated in a very tiny volume, at the atom’s center. Alpha particles that came close to this ...
PHOTONS AND THE PHOTOELECTRIC EFFECT The particle-like nature of light was revealed and studied through the work of Max Planck i ...
The energy of a photon is proportional to the frequency of the wave, E = hf where h is Planck’s constant (about 6.63 × 10−34 J·s ...
Before we get to some examples, it’s worthwhile to introduce a new unit for energy. The SI unit for energy is the joule, but it’ ...
The work function for a certain metal is 4.14 eV. What is the threshold frequency required to produce photoelectrons from this ...
only way to increase Kmax is to increase the frequency—not the brightness— of the incident light. ...
THE BOHR MODEL OF THE ATOM In the years immediately following Rutherford’s announcement of his nuclear model of the atom, a youn ...
and for other one-electron atoms—ionized helium (Z = 2), doubly-ionized lithium (Z = 3), etc.—the energy levels are where Z is t ...
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How much energy must a ground-state electron in a hydrogen atom absorb to be excited to the n = 4 energy level? When the electr ...
WAVE–PARTICLE DUALITY Light and other electromagnetic waves exhibit wave-like characteristics through interference and diffracti ...
behaves like a wave. Name or describe an experiment that demonstrates that light behaves like a particle. Here’s How to Crack ...
NUCLEAR PHYSICS The nucleus of the atom is composed of particles called protons and neutrons, which are collectively called nucl ...
Here’s How to Crack It The subscript (the atomic number, Z) gives the number of protons, which is 29. The superscript (the mass ...
Binding Energy The masses of the proton and neutron are listed below. proton: mp = 1.6726 × 10−27kg neutron: mn = 1.6749 × 10−27 ...
What happened to this missing mass? It was converted to energy when the deuteron was formed. It also represents the amount of en ...
RADIOACTIVITY The stability of a nucleus depends on the ability of the nuclear force to balance the repulsive Coulomb forces bet ...
This reaction illustrates two important features of any nuclear reaction. (1) Mass number is conserved (in this case, 222 = 218 ...
this form of beta decay, a proton is transformed into a neutron and a positron, (the electron’s antiparticle), plus another part ...
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