A grating has 6.00 × 103 lines per centimeter ruled on it. What is the angular separation between the second and the third orders on the same side of the central order when the grating is illuminated with a beam of light of wavelength 550 nm?
A) 20.5°
B) 30.5°
C) 40.6°
D) 50.5°
C
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In a nuclear power plant, the reactor produces 500°C steam that is used to power the steam turbines which generate 1500 MW of electrical power. The cooling tower eliminates the waste heat at 50°C. If the efficiency of the plant were that of a Carnot engine, at what rate would waste heat be vented to the atmosphere?
We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from
A) examining spectral lines from the atmospheres of distant planets. B) sending spacecraft to study the planets up close. C) examining high-resolution images of the planets made by orbiting telescopes. D) determining the orbital properties of the planets.
The latest evidence from 2MASS suggests our own Milky Way is type SBb
Indicate whether the statement is true or false
If the net work done on an object is positive, then the object's kinetic energy
A) decreases. B) remains the same. C) increases. D) is zero. E) cannot be determined without knowing the object's mass.