Physics
Radio telescopes are better than optical telescopes because

they can work even in cloudy conditions
they can work during the day and night
All of these
they can detect faint galaxies which no optical telescope can

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Physics
The Hooke's law is valid for

Entire elastic region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire stress strain curve
Only proportional region of the stress strain curve

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