Compare the radio and x-ray images. Can you conclude from this comparison that gas clouds containing molecules absorb x-ray light?
What will be an ideal response?
Yes
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Neutral hydrogen is most obvious in the electromagnetic spectrum:
A) in yellow light of the Sun's continuum. B) at 656.3 nm, hydrogen alpha red. C) at 21 cm in the radio region. D) at 121.3 nm, the Lyman alpha ultraviolet line. E) Neutral hydrogen has yet to be detected in space.
An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when the elastic potential energy of the system object-spring is a maximum?
A) at either A or B B) midway between A and B C) one-third of the way between A and B D) one-fourth of the way between A and B E) at none of the above points
At an instant when a particle of mass 50 g has an acceleration of 80 m/s2 in the positive x direction, a 75-g particle has an acceleration of 40 m/s2 in the positive y direction. What is the magnitude of the acceleration of the center of mass of this two-particle system at this instant?
a. 60 m/s2 b. 56 m/s2 c. 40 m/s2 d. 50 m/s2 e. 46 m/s2
Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (5.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 1.0 m
a. 0.45 kN/C b. 0.17 kN/C c. 0.28 kN/C d. 0.73 kN/C e. 0.62 kN/C