A star like the Sun emits a(n) ____ spectrum
a. absorption
b. emission
c. continuous
d. Doppler
e. ionization
a
You might also like to view...
Intensity: An 800-kHz sinusoidal radio signal is detected at a point 2.1 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.80 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 8.5 × 10-4 W/m2 B. 1.2 × 10-3 W/m2 C. 1.7 × 10-3 W/m2 D. 6.0 × 10-4 W/m2 E. 4.2 × 10-4 W/m2
Where in Venus's atmosphere are sulfuric acid clouds found?
A. at very high altitudes B. everywhere in the atmosphere C. near the surface, like fog D. There are no sulfuric acid clouds on this planet.
Which of the following is TRUE?
A. Mercury has a very thick atmosphere made mostly of carbon dioxide. B. Venus has no volcanos on its surface. C. Mercury rotates exactly one and a half times for every one revolution around the Sun. D. The runaway greenhouse effect causes the present temperatures on Mars to exceed those on Earth. E. The average surface temperature of Venus is about 30 degrees Fahrenheit.
The unit for current is the
a. ampere. b. ohm. c. coulomb. d. volt.