Multiple choice

Three pendulum clocks A, B and C are synchronized on the surface of the earth at the sea level. The clock A is taken to the top of a mountain and the clock B is taken under a deep mine. The temperatures at the three, locations are assumed to be the same. One the basic of the above, which one of the following is correct?

  1. Both A and B run faster than C

  2. Both A and B run slower than C

  3. A runs slower than C but runs faster than C

  4. B runs slower then C but A runs faster than C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pendulum period depends on gravity (T = 2π√(l/g)). At a mountain top, g is lower, so period increases (runs slower). In a deep mine, g is also lower due to mass being above, so period also increases (runs slower). Both A and B run slower than C.

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