Which of the following years had the least sunspot activity?

A) 1930
B) 1949
C) 1961
D) 1987

D) 1987

Physics & Space Science

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Flowing surface water alters the landscape in what ways?

A) erosion B) deposition of sediments C) weathering D) It weathers and erodes sediments, and then it deposits sediment.

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Answer the following statement(s) true (T) or false (F)

1. A linear traveling wave can be partially reflected when it encounters another linear traveling wave. 2. The reflection will be total

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Physics & Space Science

The order of evolutionary stages of a star like the Sun would be Main Sequence, giant, planetary nebula, and finally a ________

Fill in the blank(s) with correct word

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Physics & Space Science

Choose the lens having the shortest focal length

a.

b.

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Physics & Space Science