What condition is necessary in an interstellar gas cloud for it to begin collapsing?
A) a low density
B) a low temperature
C) a high temperature
D) a high heavy element content
E) a low heavy element content
B) a low temperature
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How can thorium be used for nuclear energy when it is not fissionable?
A) Thorium can be used as a fuel for nuclear fusion reactors. B) Thorium has strong nuclear shielding properties, which enhances the chain reaction. C) Thorium can actually be fissioned with sufficient pressure and temperature. D) The thorium can easily be converted to U-233, which is fissionable.
Peak values for a neodymium-glass laser are 1200 J for 1 nanosecond. If the cross section of the laser beam is 1 cm2, what are the maximum values of E and B? (µ0 = 4p × 10^-7 T×m/A, c = 3.00 × 10^8 m/s)
a. 3 × 10^7 V/m, 2 T c. 1 × 10^10 V/m, 3 T b. 2 × 10^8 V/m, 10 T d. 3 × 10^9 V/m, 10 T
A long cylinder (radius = 3.0 cm) is filled with a nonconducting material which carries a uniform charge density of 1.3 mC/m3 . Determine the electric flux through a spherical surface (radius = 2.0 cm) which has a point on the axis of the cylinder as its center
a. 5.7 N × m2/C b. 4.9 N × m2/C c. 6.4 N × m2/C d. 7.2 N × m2/C e. 15 N × m2/C
In space, X-rays travel faster than radio waves.
Answer the following statement true (T) or false (F)