Which of the following was a new discovery about Pluto by the New Horizons mission?
A) evidence of recent geological activity
B) the existence of moons orbiting Pluto
C) the fact that Pluto has an ice-rich composition
D) the fact that Pluto is less massive than Eris
A) evidence of recent geological activity
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A large body of nonluminous gas at a temperature of 1100°C has emission bands between 2.5 and 3.5 ?m and between 5 and 8 ?m. At 1100°C, the effective emittance in the first band is 0.8 and in the second 0.6. Determine the emissive power of this gas in W/m2.
GIVEN
• A large body of nonluminous gas
• Gas temperature (T) = 1100°C = 1373 K
• Emission bands: 2.5 ?m < ?1 < 3.5 ?m 5 ?m < ?2 < 8 ?m
• Effective emittances: ?1 = 0.8; ?2 = 0.6
FIND
• The emissive power (E) in W/m2
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
A photovoltaic cell receives energy input primarily by
A) conduction. B) convection. C) radiation. D) all of the above
A charged particle (mass = m, charge = q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed v?
a. qvB toward the east b. Zero c. qvB toward the west d. qvB upward e. qvB toward the south
Helium-neon laser light (l = 632.8 nm) is sent through a single slit of width 0.41 mm. What is the width of the central maximum on a screen 1.0 m in back of the slit? (1 nm = 10-9 m)
a. 5.3 mm c. 3.1 mm b. 4.2 mm d. 2.0 mm