The hydroxide ion has a charge of
a. 1–.
b. zero.
c. 1+.
d. 2+.
a
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The sun's energy output is a maximum in the visible region of the spectrum. One biological reason we might expect or predict this fact is that
A) it would be impossible for biological photosynthesis to occur if any other region dominated the solar spectrum, and thus plant life could not exist on Earth. B) the visible region comes right in the middle of the overall electromagnetic spectrum. C) visible radiation is the only type of solar radiation with enough energy to actually burn our skin. D) the human eye would be expected to evolve in such a way as to make use of the sun's main energy output. E) the visible region has the highest frequency.
You have a machine which can accelerate pucks on frictionless ice. Starting from rest, the puck travels a distance x in time t when force F is applied. If force 3F is applied, the distance the puck travels in time t is
a. x. b. (3/2)x. c. 3x. d. (9/2)x. e. 9x.
When the transmission axes of two Polaroid films are perpendicular to each other, what is the percentage of the incident light which will pass the two films?
A) 0% B) 25% C) 50% D) 75% E) 100%
A proton with velocity 2.0 × 105 m/s enters a region where a uniform magnetic field of 0.30 T is present. The proton's velocity makes an angle of 60° with the magnetic field
What is the pitch of the helical path followed by the proton? (The "pitch" is the distance traveled parallel to the magnetic field while making one complete revolution around a magnetic field line.) A) 0.022 m B) 0.140 m C) 0.077 m D) 0.250 m E) 0.055 m