Consider the following reaction. n ? p + e– This reaction is impossible because it violates which conservation law?
a. baryon number
b. lepton number
c. strangeness
d. charge
b
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The more precisely the position of a particle is known,
A. the more precisely its momentum can be known. B. the more precisely its energy can be known. C. the less precisely its momentum can be known. D. the shorter its deBroglie wavelength is.
What is the chief difficulty in attempting to detect planets around other stars?
A) Planets do not emit visible light. They are typically at least a billion times fainter than their host stars. B) Even the largest planets are typically at least a factor of 10 times smaller than their host stars. C) Planets do not glow in the infrared, so infrared telescopes cannot be used to study them, either. D) A and B E) A, B, and C
The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 1.54 eV B) 1.65 eV C) 1.79 eV D) 1.81 eV
Most asteroids are differentiated, as reflected by their spherical shapes
Indicate whether the statement is true or false