What is at the center of a planetary nebula?

A: the core of the dying star
B: something that will eventually become a neutron star
C: something that will eventually become a white dwarf
D: both A and B
E: both A and C


Ans: E: both A and C

Physics & Space Science

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Which wavelength band uses observatories on aircraft?

a. ultraviolet b. visual c. infrared d. X-ray

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The position function x(t) of a particle moving along an x axis is x = 5.00 - 6.00t2, with x in meters and t in seconds. (a) At what time and (b) where does the particle (momentarily) stop? At what (c) negative time and (d) positive time does the particle pass through the origin?

Physics & Space Science

As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 80.0 Hz

After the car goes by, you hear a frequency of 60.0 Hz. What is the speed of the car? Assume that he speed of sound in air is 343 m/s. A) 64 m/s B) 49 m/s C) 16 m/s D) 36 m/s E) 25 m/s

Physics & Space Science

A radioactive isotope that emits an alpha particle will change in what respect?

a. Atomic number decreases by four. b. Both choices a and b are valid. c. Mass number decreases by four. d. None of these choices are valid.

Physics & Space Science