A container with a one-liter capacity at 27° C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 10^5 N/m2.) How many moles of helium does it hold?
a. 0.041
b. 0.081
c. 0.45
d. 0.90
e. 1.0
B
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Assuming that we can measure the apparent brightness of a star, what does the inverse square law for light allow us to do?
A) determine the distance to the star from its apparent brightness B) determine both the star's distance and luminosity from its apparent brightness C) calculate the star's surface temperature if we know either its luminosity or its distance D) calculate the star's luminosity if we know its distance, or calculate its distance if we know its luminosity
A satellite in a circular orbit of radius R around planet X has an orbital period T. If Planet X had one-fourth as much mass, the orbital period of this satellite in an orbit of the same radius would be
A) T B) 2T. C) T/2. D) 4T. E) T/4.
Monochromatic light is incident on a diffraction grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light?
A) 202 nm B) 403 nm C) 605 nm D) 806 nm
After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12 J and 24 J. What can be said about the kinetic energy of the two balls before the collision?
a. nothing—not enough information is given b. the balls had the same energies, 12 J and 24 J, respectively c. the total kinetic energy of the two balls was 36 J d. none of the above