3. If the potential difference is 120 volts and the resistance is 60 ohms, what is the current?
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The light gathering of a telescope goes as the area of the telescope, therefore as the square of the aperture:
where D is the aperture of the telescope.
Therefore, using D1=8 m and D2=2 m, we find
So, the larger telescope will collect 16 times more light than the smaller one.
where D is the aperture of the telescope.
Therefore, using D1=8 m and D2=2 m, we find
So, the larger telescope will collect 16 times more light than the smaller one.