An electron is sitting on a pinpoint having a diameter of 2.5 ?m. What is the minimum uncertainty in the speed of the electron?
23 m/s
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The hot gas of the big bang seems to be cool at about 2.7 K because:
A) the expansion of the Universe has decreased the wavelengths of the radiation emitted by the big bang. B) the gas clouds that emitted the photons during the big bang had a temperature of 2.7 K. C) the expansion of the Universe has redshifted the wavelengths of the radiation emitted by the big bang about 1100 times longer. D) the gas clouds that emitted the photons during the big bang emitted blackbody radiation with a wavelength of 2.7 nm.
One possible ingredient of dark matter is known as WIMPs, or weakly interacting massive particles. Our best guess is that WIMPs probably are made of protons and neutrons
Indicate whether the statement is true or false
The person who expounded the uncertainty principle was __________
Fill in the blank(s) with correct word
A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. the fuel pushes on the ground. b. air friction pushes on the escaping fuel. c. the downward force of gravity on the rocket is less than the rate of downward momentum increase of the fuel. d. of none of the above reasons.