The most massive part of the atom is(are) the ____ which has(have) a ____ charge
a. electrons; negative
b. nucleus; negative
c. electrons; positive
d. nucleus; positive
d
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Shell Radius: If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n, then
A. its radius and binding energy will double. B. its radius will quadruple and the binding energy will double. C. its radius will double and the binding energy will quadruple. D. its radius will quadruple and the binding energy will be reduced by a factor of four. E. its radius and binding energy will quadruple.
When an electron jumps from an orbit where n = 4 to one where n = 3
A) a photon is emitted. B) a photon is absorbed. C) two photons are emitted. D) two photons are absorbed.
A 3.00-m-long 200-N ladder, leans against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall. The ladder is not completely uniform, so its center of gravity is 1.20 m from its base
What force of friction must the floor exert on the base of the ladder to prevent the ladder from sliding down? A) 93.3 N B) 130 N C) 28.3 N D) 102 N E) 150 N
A doubly convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?
A) 70 cm B) 63 cm C) 75 cm D) 66 cm E) 58 cm