Radioactivity Basics: A gamma ray is also known as
A. an electron.
B. a positron.
C. a helium nucleus.
D. a high-energy photon.
Answer: D
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Energy Levels:Consider the Bohr model for the hydrogen atom. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) (a) How much energy (in eV) is needed to cause a transition of an electron from the second excited state to the third excited state?(b) What wavelength photon just has enough energy to initiate the transition in (a)?
What will be an ideal response?
Why is the main sequence main? Why are these stars so common?
What will be an ideal response?
A hose has been clamped so that the area at the clamp is only one quarter the area of the rest of the hose. When we ignore the viscosity of water, the ratio of the volume of water delivered per unit time when the clamp is on to the volume of water delivered per unit time without the clamp is
A.
.B.
.C.
.D.
.E.
A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
a. 2.8 b. 1.7 c. 1.3 d. 4.0 e. 1.0