The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. Which labeled transition represents an electron that absorbs a photon with 10.2 eV of energy?
A) A
B) B
C) C
D) D
E) E
B) B
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The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct?
a.
Star A is twice the mass of star B.
b.
Star B is twice the mass of star A.
c.
Star A is ten times the mass of star B.
d.
Star B is ten times the mass of star A.
e.
Star A and Star B have the same mass.
All radio telescopes are refracting telescopes
Indicate whether the statement is true or false
Einstein won the Nobel Prize for explaining
a. general relativity. b. special relativity. c. the photoelectric effect. d. quantum mechanics.
A recent announcement indicated that magnetic motors can be used to cool refrigerators. In the method, a gadolinium-based warms and cools off in response to application of a magnetic field. The gadolinium rotating wheel is the only moving part
Why might this be a breakthrough?