If it is noon at one location on Earth, what time is it at a location directly on the other side of Earth?

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Solution

Midnight.

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A radar has a power of 1 KW and is operating at a frequency of 10 GHz. It is located on a mountain top of height 500 m. The maximum distance up to which it can detect object located on the surface of the earth is [Radius of earth = $6.4 \times 10^{6}$ m]

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