What information does 21 cm radiation provide about the gas clouds?
A) their motion
B) their distribution
C) their density
D) their temperature
E) all of these
E
You might also like to view...
Shown following are five different colors of visible light that travel to Earth from the Sun. Rank these colors of visible light from left to right based on the altitude in the atmosphere where they are completely absorbed, from highest to lowest (Earth’s surface). If two (or more) of the choices reach the surface, rank them as equal by dragging one on top of the other(s).
Planet Zero has a mass of 4.0 × 1023 kg and a radius of 2.0 × 106 m. A 10-kg space probe is launched vertically from the surface of Zero with an initial kinetic energy of 8.0 × 107 J. What maximum distance from the center of Zero is achieved by the probe?
A. 3.2 × 106 m B. 4.0 × 106 m C. 6.0 × 106 m D. 5.0 × 106 m E. 2.5 × 106 m
If the radiant energy from the sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B
a. 300 V/m, 10?4 T b. 1 000 V/m, 3.35 × 10^?6 T c. 225 V/m, 1.60× 10?3 T d. 111 V/m, 3.00 × 10^?5 T e. 711 V/m, 2.37 × 10^?6 T
The rate of expansion of the universe is currently increasing
Indicate whether the statement is true or false