Which of the following lasers emits photons with the lowest energy? a. an Ar^+ l

Question

Which of the following lasers emits photons with the lowest energy? a. an Ar^+ laser with lambda = 514.5 nm b. a He-Ne laser with lambda = 633 nm c. a Kr^+ laser with lambda = 647 nm d. a Nd: YAG laser with lambda = 1064 nm e. an ArF laser with lambda = 193 nm Which of the following statements about energy, systems, and surroundings is NOT true? a. The system can do work on the surroundings. b. The surroundings can provide thermal energy to the system. c. The system can be a chemical reaction that occurs in a sample of matter. d. The system is the part of the universe that is the focus of thermochemical study. e. The surroundings experience the same energy change as the system in order to keep the total energy in the universe constant. Bond length and bond strength are _____ a. arbitrary. b. unrelated. c. directly proportional. d. identical. e. inversely proportional. Which type of bonding involves the sharing of valence electrons by two atoms? a. polar ionic b. metallic c. covalent d. ionic e. intramolecular

Explanation / Answer

11. Energy is inversely propotional to wavelength, given by E=hc/(wavelength). So, higher wavelength lower energy. That is, option d.

12. Not sure about this part.

13. Inverse relation. Stronger bond, shorter the length So option c.

14. Covalent bonds involve sharing of electrons. So option c.

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