In an electroplating process, it is desired to deposit 40.0 mg of silver on a metal part by using a ...

In an electroplating process, it is desired to deposit 40.0 mg of silver on a metal part by using a current of 2.00 A.
 
  How long must the current be allowed to run to deposit this much silver? (The silver ions are singly charged, and the atomic weight of silver is 108.)

Question 2

An ideal gas is expanded isothermally from 20 L to 30 L. During this process, 6 J of energy is expended by the external mechanism that expanded the gas. Which of the following statements is correct?
 
  A) 6 J of energy flow from surroundings into the gas.
  B) 6 J of energy flow from the gas into the surroundings.
  C) No energy flows into or from the gas since this process is isothermal.
  D) None of the above statements is correct.

Question 3

In the two-slit experiment, for the condition of dark fringes, the value of m = +1 corresponds to a path difference of 3/2.
 
  Indicate whether the statement is true or false