Light is incident on a double-slit. The fourth bright band has an angular distance of 7.0° from the central maximum. What is the distance between the slits (in ?m)? (Assume the frequency of the light is 5.4 × 10^14 Hz.)
a. 27
b. 21
c. 24
d. 18
e. 14
d
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How much kinetic energy must a deuterium ion (charge = 1.6 × 10^–19 C) have to approach within 1.7 × 10^?14 m of another deuterium ion? (ke = 8.99 × 10^9 N·m2/C2 and 1 keV = 1.6 × 10^–16 J)
a. 50 keV b. 110 keV c. 10 keV d. 80 keV e. 140 keV
Consider a small satellite moving in a circular orbit (radius r) about a spherical planet (mass M). The period does not depend upon
A) g at the satellite position. B) the planet mass. C) the satellite mass. D) the radius r. E) the universal gravitational constant.
When a gas is changed to a liquid phase, the gas
A) releases energy. B) absorbs energy. C) neither of these
Suppose that there are 10 billion (10,000,000,000,000 ) habitable planets in our galaxy, that 1 in 5 habitable planets has life, that 1 in 1000 planets with life has at some point had an intelligent civilization, and that 1 in 1000 civilizations that
have ever existed is in existence now. How many civilizations would exist at present? A) 200,000 B) 2,000,000 C) 20,000 D) 20,000,000