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11th Class Physics Physical World / भौतिक जगत Question Bank Units and Measurements Conceptual Problems

  • question_answer
    In defining the standard of length, (the prototype metre), we have to specify the temperature at which the measurement should be made. Are we justified in calling length a fundamental quantity, if another physical quantity (temperature) has to be specified in choosing a standard?

    Answer:

                      Yes, the choice of length as a fundamental quantity is justified. The modem definition of metre in terms of wavelength of light radiation is not affected by temperature.


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