Which one of the following is a characteristic of a compound microscope?
A) The objective is a concave lens.
B) The eyepiece is a concave lens.
C) The final image is real.
D) The image formed by the objective is virtual.
E) The image formed by the objective is real.
E
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Which statement below is true?
A) If we could build a spaceship capable of traveling at a speed very near the speed of light, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes. B) If we could build a spaceship capable of traveling at a speed very near the speed of light, we could send a ship to a star that is 500 light-years away and it would return just a few years after we launched it. C) Thanks to effects of special relativity, we could build a spaceship that could go close to the speed of light with much less fuel than we would have guessed from Newton's laws of motion. D) Because special relativity tells us that we cannot reach or exceed the speed of light, it means that distant stars will never be within our reach because the time required to reach them will always be quite long, even with very fast spaceships.
The energies of two photons you might detect emitted by hydrogen atoms are 10.2 and 2.1 eV. Which photon has the longest wavelength?
A) the 10 eV photon B) the 2.1 eV photon C) They both have the same wavelength.
Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant speed in a straight line across the Atlantic Ocean. Can you detect this motion [i.e
, can you tell that you are moving] without directly or indirectly making use of anything outside of your own reference frame? If so, how could you detect this; and if not, why not? A) Yes. For example, if you dropped a coin you would find that it lands to the rear of the drop point. B) Yes. For example, if you dropped a coin you would find that it lands to the front of the drop point. C) No, because of the principle of relativity. D) No, because of the principle of the constancy of lightspeed. E) No, because jet planes move far too slowly for such an effect to actually be observed.
If the magnetic field in an EM wave is in the x-direction and the electric field in the wave is in the y-direction, the wave is traveling in the
A) x-y plane. B) direction halfway between the x- and y-directions. C) z-direction. D) x-direction. E) negative z-direction.