The threshold wavelength for photoelectric emission of a particular substance is 500 nm. What is the work function (in eV)?
a. 4.2
b. 4.0 × 10^?19
c. 4.0 × 10^?10
d. 2.5 × 10^?19
e. 2.5
e
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What does the word "normal" mean in the phrase "normal force"?
A) the force that is usually exerted by a surface B) the total force exerted by a surface C) the component of the force exerted by a surface parallel to the surface D) the component of the force exerted by a surface perpendicular to the surface E) the force is due to contact between two objects.
The Galactic Year is the time for our solar system to orbit the Galaxy; it is about:
A) 15 million years. B) 225 million years. C) 4.5 billion years. D) 9.6 billion years. E) 13.5 billion years.
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) sending spacecraft to study the planets up close. B) examining spectral lines from the atmospheres of distant planets. C) examining high-resolution images of the planets made by orbiting telescopes. D) determining the orbital properties of the planets.
Based on its surface features, the most important event on Venus in the past billion years or so was
A) a global "repaving" that erased essentially all the surface features that had existed earlier. B) the eruption of a giant volcano that formed one of Venus's "continents." C) the impact of an unusually large asteroid that left a deep scar on one side of the planet. D) the onset of mantle convection, which caused Venus's lithosphere to split into plates like those on Earth.