Physics
The characteristic invalid for heat radiation is that it travels :

In a straight line
In all directions
With the speed of light
Heating the medium through which it passes

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Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It is smaller than the earth
It revolves on its axis in adirection opposite to that ofthe earth
It rotates at the same speed as the earth around the sun

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