As an electron slows down from 0.9980c to 0.5000c, how much momentum does it lose?
(c = 3.0 × 108 m/s, melectron = 9.11 × 10-31 kg)
4.2 × 10-21 kg ? m.s
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Fill in the blank(s) with the appropriate word(s).
Power: Suppose you left five 100-W light bulbs burning in the basement for two weeks. If electricity costs 10.0¢/kW?h, (a) how much did the electricity cost (to the nearest dollar) to leave those bulbs on, and (b) how many joules of electrical energy did they consume?
What will be an ideal response?
Which event marks the birth of a star?
A) Formation of the planetary nebula B) Fusion of hydrogen atoms into helium atoms C) Collapse of an interstellar cloud D) Formation of a photosphere E) Instability in an interstellar cloud
In the Bohr model of the hydrogen atom the non-radiating orbits are determined by quantizing the ________ (physical quantity).
What will be an ideal response?