What happened in the Planck Era? At what temperature did it end?
What will be an ideal response?
The Planck Era was the first 10-35 seconds of the universe. We do not know what happened, because we do not have a theory of quantum gravity or knowledge of the interior of a singularity. When the Planck Era was over, the universe had cooled to only 10-32 K.
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The time constant in an RC circuit is the time that is required for the current in a circuit with an initially uncharged capacitor to reach what percentage of its final value?
A. 63% B. 90% C. 37% D. 100% E. 50%
A converging lens will cause parallel rays of light to
A. Bend to meet at the focal point of the lens. B. Remain parallel C. Bend as though coming from the focal point of the lens. D. Scatter in random directions.
Light travels through non-cubic transparent crystals
A) in mutually perpendicular directions. B) without refracting. C) and becomes polarized in the process. D) at different speeds along different optic axes. E) none of the above
A baseball (1 kg) has an energy of 100 joules. If its uncertainty in position is 1 m, what is the percentage uncertainty (Dp/p × 10^0) in the momentum of the baseball?
a. <<1% b. 1% c. 2% d. 5% e. 10%