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Atomic clock generally used in the natio...

Atomic clock generally used in the national standards, is based on the periodic vibrations produced in a 

A

cesium atom

B

carbon atom

C

hydrogen atom

D

krypton atom

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • Atomic clock generally used in the national standards, is based on the periodic vibrations of period

    A
    `pm 1 xx 10^(-13)` s
    B
    `pm 1 xx 10^(13)` s
    C
    `pm 1 xx 10^(-31) ` s
    D
    `pm 1 xx 10^(-35)` s

  • Statement A : At absolute zero the substance has internal energy due to the vibrational motion of atoms with in the molecules. This is zero point energy. Statement B : First law of thermodynamics does not satisfy the condition under which a body can use its heat energy to produce the work.

    A
    A is true, B is false
    B
    A is false , B is true
    C
    A & B are true
    D
    A is true, B is false

  • Statement A: At absolute zero the substance has internal energy due to the vibrational motion of atoms with in the molecules. This is zero point energy. Statement B: First law of thermodynamics does not satisfy the condition under which a body can use its heat energy to produce the work.

    A
    A is true, B is false
    B
    A is false, B is true
    C
    A & B are true
    D
    A is true, B is false

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    Answer the following question based on the values of the atomic radii of the elements of one of the periods in modern periodic table Li ( 152 ) , Be (111) B, (88) , C (77) ,N (74) ,o (66 ) and F (64) In the numerical listing of periods in the modern periodic table , what number was given to above elements ?

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