The speed of sound in air is at and at

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

Problem

The speed of sound in air is

343\,\text{m s}^{-1}

20^{\circ}\text{C}

and

349\,\text{m s}^{-1}

30^{\circ}\text{C}

. A pipe closed at one end has length 1.20 m and is vibrating in its fundamental mode. What will be its fundamental frequency at

30^{\circ}\text{C}

? (a)

71.4\,\text{Hz}

(b)

74.8\,\text{Hz}

(c)

72.7\,\text{Hz}

(d)

70.0\,\text{Hz}