A principal mechanism for energy loss during nuclear fusion is bremsstrahlung. This loss is associated with
a. x-rays emitted due to electron-ion collisions.
b. radiation losses due to T4 losses.
c. conduction losses associated with ?T.
d. convection losses associated with ?T.
e. neutron collisions with atoms of moderator.
a
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Uncertainty Principle Using Energy and Time: A laser produces a beam of 4000-nm light. A shutter allows a pulse of light, 30 ps in duration, to pass through. What is the uncertainty in the energy of a photon in the pulse? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2 ×10-6 eV B. 2 ×10-5 eV C. 2 ×10-4 eV D. 2 ×10-3 eV E. 2 ×10-2 eV
Why isn't Earth's atmosphere mostly hydrogen?
A) Earth formed too close to the Sun for any planetesimals to have hydrogen. B) All the hydrogen was blasted away during the early bombardment stage of the solar system. C) Light gases such as hydrogen move faster than heavier gases and escape from Earth's gravitational field. D) The hydrogen is frozen in the polar ice caps. E) All the hydrogen reacted with oxygen and formed the oceans.
The term age of reptiles is sometimes used to refer to the ______________ era
Fill in the blank(s) with correct word
A block lies on a smooth inclined plane tilted at an angle of 35° to the horizontal. (a) Draw the free-body diagram for the block. (b) Determine the block's acceleration as it slides down the inclined plane
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline. (d) How long did it take the block to reach the bottom of the inclined plane?