According to our present theory of solar system formation, which of the following lists the major ingredients of the solar nebula in order from the most abundant to the least abundant?
A) hydrogen and helium gas; hydrogen compounds; rock; metal
B) hydrogen compounds; hydrogen and helium gas; metal; rock
C) hydrogen and helium gas; rock; metal; and hydrogen compounds
D) hydrogen; water; methane; and helium
A) hydrogen and helium gas; hydrogen compounds; rock; metal
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Light having a wavelength equal to the peak wavelength of a star of what temperature can produce photoelectrons from manganese 
A. 960 K B. 23000 K C. 9600 K D. 96000 K E. 2300 K
The Doppler formula states that the ratio of the velocity of a source to the speed of light is equal to the ratio of the change in wavelength caused by the Doppler shift to the source wavelength, or A spacecraft has yellow headlights which radiate 600nm photons, and is travelling toward a stationary observer. If the spacecraft is travelling at a velocity of 1% of the speed of light (0.01c), what
will be the amount of the shift in wavelength observed (in nanometers)? What will be an ideal response?
Which of the two signs shown below would indicate the greatest danger?
What is the angle between the noon sun on the winter solstice and the southern horizon for an observer at a latitude of 38° N?
a. 38° b. 52° c. 75.5° d. 28.5° e. 14.5°