The de Broglie wavelength of a 0.069 kg golf ball is 4.67 × 10^?34m. What is its speed? (h = 6.63 × 10^?34 J?s)
a. 10 m/s
b. 21 m/s
c. 3.1 m/s
d. 90 m/s
e. 4.5 m/s
b
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Which of the following statements best describes how the uncertainty principle affects conservation of energy?
A) The uncertainty principle allows very short time-scale violation of energy conservation, but energy must still be conserved on time scales that allow measurement. B) The uncertainty principle invalidated the law of conservation of energy, and as a result, this law is no longer useful to physicists. C) The uncertainty principle does not apply to energy, so conservation of energy is not affected by it. D) The uncertainty principle tells us that the law of conservation of energy applies only to very large objects, not to atoms or molecules.
The kinetic energy of a planet is maximum when it is
A) closest to the Sun. B) farthest from the Sun. C) least accelerating. D) none of the above
Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids B) different organisms use different sets of amino acids C) all proteins are made of amino acids D) some organisms don't use amino acids at all
A rectangular garden measures 15 m long and 13.70 m wide. What is the length of a diagonal from one corner of the garden to the other?
A) 18 m B) 19 m C) 20 m D) 4.1 × 102 m