Which of the following statements are true for the Bohr model of the atom? (There could be more than one correct choice.)
A) The spacing between all the electron shells is the same.
B) The energy difference between all the electron shells is the same.
C) As we look at higher and higher electron shells, they get closer and closer together, but the difference in energy between them gets greater and greater.
D) As we look at higher and higher electron shells, they get farther and farther apart, but the difference in energy between them gets smaller and smaller.
E) There is no general pattern in the spacing of the shells or their energy differences.
D
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Radioactive Decay: Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you. How much of this isotope will you have 3 days after it was delivered to you?
A. more than 2.5 grams but less than 5 grams B. 2.5 grams C. more than 1.25 grams but less than 2.5 grams D. 1.25 grams E. less than 1.25 grams
A 4.00 kg ball is traveling at 3.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s. If the contact with the wall by the ball lasts for 0.10 seconds, then the average force on the ball is
A. 230 N. B. 280 N. C. 320 N. D. 360 N. E. 400 N.
Why is the air at higher altitudes cooler than that at lower altitudes?
A. Because of the relation expressed in Charles' Law, V/T = constant. B. Because of the relation expressed in Gay-Lussac's Law, P/T = constant. C. Because of the relation expressed in Boyle's Law, PV = constant.
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes 0.8 s for the wave to travel the 20 m to the opposite tower. If one meter of the rope has a mass of 0.35 kg, find the tension in the tightrope