If the electric field is halved in a region of space, what happens to the electric field energy in a 10 cm3 volume of this space
a. It quadruples.
c. It halves.
b. It becomes one fourth as much.
d. It doubles.
B
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A star is on the horizontal branch of the H-R diagram. Which statement is true?
A) It is burning only helium. B) The star is contracting. C) The star is about to return to the main sequence. D) It is about to experience the helium flash. E) It is burning both hydrogen and helium.
If the density of the universe is at the critical density, then the geometry of the universe would follow ordinary Euclidean geometry
Indicate whether the statement is true or false
Green light has a wavelength of 5.4 × 10^?7 m. What is the frequency of this EM-wave in air?
a. 5.55 × 10^14 Hz b. 6.00 × 10^11 Hz c. 9.00 × 10^8 Hz d. 3.00 × 10^10 MHz e. 1.80 × 10^15 Hz
One disadvantage of dispersion-strengthened metals at high temperatures is that the dispersion and the matrix are not in _________with each other, and as a result the matrix and dispersion may react with each other.
Fill in the blank(s) with the appropriate word(s).