When we look at pictures of distant objects in the universe, the images of the objects often are distorted by gravitational lensing
Indicate whether the statement is true or false
TRUE
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Compared to the diameter of a zirconium atom (A = 40), the diameter of a mercury atom (A = is approximately
A) four times as large. B) twice as large. C) the same size. D) one-half as large. E) one-quarter as large.
An electron (m = 9.1 × 10^-31 kg) has a speed of 0.90 c. What is the difference between its relativistic momentum and its non-relativistic momentum (in kg m/s)?
a. 4.3 × 10^-22 b. 3.2 × 10^-22 c. 5.4 × 10^-22 d. 6.5 × 10^-22 e. 2.5 × 10^-22
What is the upper limit of a brown dwarf's size?
a. no upper limit b. 0.50 solar masses c. 0.10 solar masses d. 0.08 solar masses e. less than 0.08 solar masses
When examining a spectrum of a particular galaxy, an astronomer notices that thespectral lines are shifted toward shorter wavelengths. What does this mean?
a) the element Helium is present in that galaxy b) the galaxy is moving away from us c) the galaxy is very likely to be one of the nearest galaxies to the MilkyWay d) the entire Universe is contracting e) the galaxy is rotating very rapidly