The probability cloud for the electron in the hydrogen atom has an average radius
A) quite different from the radius predicted by Bohr.
B) in agreement with the orbital radius of Bohr.
C) as yet not accurately measured.
Answer: B
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The book shows a photograph of a human face, taken at shorter and shorter camera exposure times. What is observed at the shortest exposure times, and what does this observation demonstrate about the nature of light?
A) We observe a very dim but complete image of the face, showing that light is made of waves that have smaller amplitude as the light is reduced. B) We observe light and dark lines due to interference, showing that light is a wave. C) Individual white dots are distributed all over the photographic plate, showing that light is made of waves. D) We observe individual white dots at the center of the photograph, showing that the camera tends to focus individual photons at this point. E) Individual white dots were distributed randomly over the photographic plate, showing that light interacts with the screen in tiny bundles.
Which of the following statements describes a polar molecule?
A) The electrons in the molecule are distributed evenly throughout the molecule. B) The molecules are usually not attracted to one another very strongly. C) Polar molecules have the weakest intermolecular interactions with ionic compounds. D) The molecules have a high degree of symmetry. E) None of these statements describe polar molecules.
A pendulum is made by suspending a solid circular disk from a pivot point that is at the edge of the disk with the plane of the disk lying in the vertical plane. The period of oscillation of the disk is T
If a disk with the same radius but a mass four times is great is suspended the same way, what will be its period of oscillation? A) 4T B) T/2 C) 2T D) T E) T/4
The discovery of a supernova by Tycho Brahe in 1572 contradicted the commonly held belief that the universe was
A) unchanging B) spherical C) infinite D) perfect