Three simple pendulums P, Q and R are set up on Earth

PHYSICS · Subjective · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

Three simple pendulums P, Q and R are set up on Earth. The length of Q is

1.44\,\text{m}

. The period of P is twice that of Q, while the frequency of R is three times that of P. Calculate the length of pendulum R.