Periods are divided into
a. eons.
b. epochs.
c. millennia.
d. eras.
b
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Aluminum alloys such as 2024 and 7050 _________ recommended for welding.
Fill in the blank(s) with the appropriate word(s).
A person who sees more clearly under water without eyeglasses or a facemask is
A) nearsighted. B) farsighted. C) neither of these
A piece of taffy slams into and sticks to another identical piece of taffy at rest. The momentum of the two pieces of taffy stuck together after the collision is the same as it was before the collision
Kinetic energy is a different story, for part of it turns into heat. What percentage of the kinetic energy converts into heat? A) 0% B) 25% C) 50% D) 75% E) not enough information
An 18-mm wide diffraction grating has rulings of 880 lines per mm. Monochromatic light of 590 nm wavelength is incident normally on the grating
What is the largest angle, measured from the central bright spot, at which an intensity maximum is formed? A) 23° B) 25° C) 31° D) 29° E) 27°