How does the calculated value of the age of the universe vary as the value of Hubble's constant increases?
The calculated age of the universe decreases as the value of Hubble's constant
increases.
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How does a permanent magnet work, i.e., what is the explanation of its magnetic effects?
A) Electric charge is permanently separated within the magnet, with positive static charge at one end and negative static charge at the other end of the magnet. B) Electrons orbiting individual atoms in the magnet are all aligned together so that their orbital motion produces a large overall effect. C) The material of the magnet is highly ionized, with one type of ion residing on one end of the magnet and the other type of ion residing on the other end. D) Subatomic particles known as "magnetic poles" are placed on each end of the magnet, with one type of pole placed on one end and the other type on the other end. E) Magnets are a communist plot.
The wave functions of some molecules are a combination of wave functions with different values of the orbital quantum number . The wave function of PF5 combines s, p and d states in an sp3d hybrid orbital. We would expect such an overlap of wave functions in individual molecules to represent
a. ionic bonding b. metallic bonding. c. covalent bonding. d. Van der Waal's bonding. e. hydrogen bonding.
The ripple frequency of a bridge rectifier is
a. double the input frequency. b. the same as the input frequency c. triple the input frequency. d. quadruple the input frequency.
A long wire carries a current toward the north in a magnetic field that is directed vertically downward. What is the direction of the magnetic force on the wire?
a) west b) north c) east d) vertically upward e) vertically downward