Observations indicate that over billions of years, galaxies in general tend to change from
A) smaller and bluer to larger and redder.
B) larger and redder to smaller and bluer.
C) smaller and redder to larger and bluer.
D) larger and bluer to smaller and redder.
A) smaller and bluer to larger and redder.
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Which of the following best describes the image from a plane mirror?
a. virtual and magnification greater than one b. real and magnification less than one c. virtual and magnification equal to one d. real and magnification equal to one
In the fission reaction 235U + 1n ? 141Ba + 92Kr + x 1n, what is the number x of neutrons produced?
A) 0 B) 1 C) 2 D) 3
Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV
What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.62 × 10-19 J B) 0.21 × 10-19 J C) 0.36 × 10-19 J D) 0.48 × 10-19 J E) 0.33 × 10-19 J
An eagle, with a wingspread of 2.0 m, flies toward the north at 8.0 m/s in a region where the vertical component of the earth's magnetic field is 0.20 × 10-4 T
What emf would be developed between the eagle's wing tips? (It has been speculated that this phenomenon could play a role in the navigation of birds, but the effect is too small, in all likelihood.)