A person is nearsighted with a far point of 75.0 cm
(a) What focal length contact lens is needed to give him normal vision?
(b) What is the power of the corrective lens?
(a) -75.0 cm (b) -1.33 diopters
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If a body's acceleration is doubled then the amount of force acting on the body had to _______
a. double b. halve c. stay the same d. None of the other choices are correct.
We can model a general cyanine-type dye molecule as if it contained N electrons trapped in a “box”-like potential energy function, where N is some even integer. The energy of a single quanton in a box is given by En = E1n2, where n is an integer and E1 is the energy of the ground (n = 1) energy level. If for a given molecule there are four electrons trapped in the molecule’s “box,” what is the lowest possible total energy of those electrons?
A. Etot = E1 B. Etot = 4E1 C. Etot = 8E1 D. Etot = 10E1 E. Etot = 30E1
The Moon contains small amounts of frozen water that is mixed in with its rocks.
Answer the following statement true (T) or false (F)
The force that is exerted by a magnet as it picks up iron nails could be best described as
A) the electric force exerted by electrons in the magnet, on electrons in the nails. B) the force of attraction between the nuclei of atoms in the magnet and the nuclei of atoms in the nails. C) the magnetic force exerted by electrons moving within the magnet, on electrons moving within the nails. D) the electric force exerted by ions in the magnet on electrons in the nails. E) the magnetic force exerted by ions moving within the magnet on electrons moving within the nails.