2. Solved Papers
  3. VIT Engineering

VIT Engineering VIT Engineering Solved Paper-2014

  • question_answer
    Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 nm is incident on it a potential of 7.7 V is required to stop the photoelectrons from reaching the collector plate. How much potential will be required to stop photoelectrons, when light of wavelength 200 nm is incident on it?

    A) 15.4V 

    B) 2.35V

    C) 3.85V                    

    D) 1.5V

    Correct Answer: D

    Solution :

    \[A{{g}_{2}}C{{O}_{3}}\] and  \[=\frac{2.76\times 216}{276}=2.16g\]             \[\begin{align}   & C{{H}_{3}}-CH-C{{H}_{2}}C{{H}_{2}}OH\xleftarrow{{{H}_{2}}O} \\  & | \\  & C{{H}_{3}} \\  & \text{3-meethyl butanol} \\ \end{align}\]                  \[\begin{align}   & C{{H}_{3}}-CH-C{{H}_{2}}C{{H}_{2}}OMgBr \\  & | \\  & C{{H}_{3}} \\ \end{align}\]             \[Ph-C\equiv C-C{{H}_{3}}+{{H}_{2}}O\xrightarrow{H{{g}^{2+}}/{{H}^{+}}}\]                   \[\begin{align}   & OH \\  & | \\  & Ph-C=CH-C{{H}_{3}} \\ \end{align}\]             \[\begin{align}   & OOH \\  & ||| \\  & Ph-C-C{{H}_{2}}C{{H}_{3}}\xleftarrow[-{{H}_{2}}O]{}Ph-C-C{{H}_{2}}C{{H}_{3}} \\  & | \\  & OH \\ \end{align}\]                    \[\xleftarrow[{{H}_{2}}O]{H{{g}^{2+}}/{{H}^{+}}}\]                   = 1.5 V


You need to login to perform this action.
You will be redirected in 3 sec spinner