A hypothetical particle has a mass of 510 MeV/c2. If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J? s)
4.87 × 10-15 m
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What is not used in determining a distance from spectroscopic parallax?
A: apparent brightness B: temperature from spectrum C: H-R Diagram D: inverse square law E: none of the above- they're all used!
As a rotating gas cloud contracts, it spins faster
Indicate whether the statement is true or false
The following formulas are supposed to describe the speed 
of a sphere sinking in a thick fluid. C is a unitless constant, 
is the fluid’s density in kg/m3, A is the sphere’s cross-sectional area, m is its mass, and is the gravitational field strength in N/kg. Which could be right?
A. 
= CA g
B. = Cmg/ A
C. = (Cmg/ A)2
D. = (Cmg/ A)1/2
E. None of these can be correct.
Eukaryotes
A) are made of two cells fused together B) are all unicellular C) can be unicellular or multicellular D) are all multicellular