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Statement 1 : Potassium and caesium are ...

Statement 1 : Potassium and caesium are useful as electrodes in photoelectric cells.
Statement 2 : Potassium and caesium, when irradiated with light, the light energy absorbed is sufficient to eject out the electron from a atom.

A

Statement 1 is True, statement 2 is True , Statement 2 is Correct explanation for Statement 1.

B

Statement 1 is True, Statement 2 is True , Statement 2 is NOT a correct explanation for Statement 1.

C

Statement 1 is True, Statement 2 is False

D

Statement 1 is False, Statement 2 is True.

Text Solution

Verified by Experts

The correct Answer is:
A
Low ionisation energis of potassium and cresium.
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Why are potassium and caesium, rather than lithium used in photoelectric cells?

The work function for Caesium atom is 1.9 eV. Calculate the threshold wavelength of the radiation. If Caesium is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected electron.

Knowledge Check

  • Assertion : Potassium and caesium are useful as electrodes in photoelectric cells. Reason : Potassium and caesium, when irradiated with light, the light energy absorbed is sufficient to eject out the electron from a atom.

    A
    If both (A) and (R) are correct and (R) is the correct explanation of (A).
    B
    If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
    C
    If (A) is correct, but (R) is incorrect.
    D
    If both (A) and (R) are incorrect.

  • Statement I : When a certain wavelength of light fall on a metal surface it ejects electron. Statement II : Light has wave nature.

    A
    Statement I is True, Statement II is True, Statement II is a correct explanation for Statement I
    B
    Statement I is True, Statement II is True, Statement II is not a correct explanation for Statement I
    C
    Statement I is True, Statement II is False.
    D
    Statement I is False, Statement II is True.

  • Statement 1 : Conversion of potassium ferrocyanide to potassium ferricyanide is an oxidation process. Statement 2 : Oxidation is the addition of an electronegative element to a substance or removal of an electropositive element from a substance.

    A
    Statement 1 is 'True, statement 2 is True, Statement 2 is Correct explanation for Statement 1.
    B
    Statement 1 is True, Statement 2 is True, Statement 2 is NOT a correct explanation for Statement 1.
    C
    Statement 1 is True, Statement 2 is False.
    D
    Statement 1 is False, Statement 2 is True.

    • Similar Questions

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    The kinetic energies of photoelectrons emitted from a metal are K_1 and K_2 when it is irradiated with lights of wavelength lambda_1 and lambda_2 respectively. The work function of the metal is

    The kinetic energies of photoelectrons emitted from a metal are K_(1) and K_(2) when it is irradiated with lights of wavelength lamda_(1) and lamda_(2) respectively. The work function of the metal is

    Statement 1 : Ionization enthalpy is the energy released to remove an electron from an isolated gaseous atom in its ground state. Statement 2 : All elements have a tendency to lose the electron to attain stable configuration.

    Assertion : Lithium will be more useful than copper for making a photoelectric cell when working with visible light. Reason : Work function of Li is 2.3 eV whereas Cu has a work function 4.0 eV.

    Statement 1 : In the reaction between potassium permanganate and potassium iodide, permanganate ions act as oxidising agent. Statement 2 : Oxidation statc of manganese changes from +2 to +7 during the reaction.

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