The arms of a radium watch glows in dark. What kind of body is the arm?

Transparent object

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Translucent object

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Luminous object

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Non-luminous object

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Solution

The correct option is C Luminous object
Luminous objects emit light on their own whereas non-luminous objects reflect the light they receive from a luminous source. Here due to presence of radium on wristwatch, it glows in dark and acts a luminous object.

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The arms of a radium watch glows in dark. What kind of body is the arm?

The correct option is C Luminous objectLuminous objects emit light on their own whereas non-luminous objects reflect the light they receive from a luminous source. Here due to presence of radium on wristwatch, it glows in dark and acts a luminous object.

The correct option is C Luminous object
Luminous objects emit light on their own whereas non-luminous objects reflect the light they receive from a luminous source. Here due to presence of radium on wristwatch, it glows in dark and acts a luminous object.