In a closed-end pipe of length

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

105\ \text{cm}

, standing waves are set up corresponding to the third overtone. Which of the following distances from the closed end is a pressure node? (1)

20\ \text{cm}

(2)

60\ \text{cm}

(3)

85\ \text{cm}

(4)

45\ \text{cm}