## If the length of a stretched string is shortened by 40% and the tension is increased by 44%…

Q: If the length of a stretched string is shortened by 40% and the tension is increased by 44%, then the ratio of the final and initial fundamental frequencies is

(a) 3 : 4

(b) 4 : 3

(c) 1 : 3

(d) 2 : 1

Ans: (c)

## An open pipe resonates with a tuning fork of frequency 500 Hz. It is observed that two successive notes…

Q: An open pipe resonates with a tuning fork of frequency 500 Hz. It is observed that two successive notes are formed at distances 16 and 46cm from the open end. The speed of sound in air in the pipe is

(a) 230 m/s

(b) 300 m/s

(c) 320 m/s

(d) 360 m/s

Ans: (b)

## A long glass tube is held vertically in water. A tuning fork is truck and held over the tube…

Q: A long glass tube is held vertically in water. A tuning fork is truck and held over the tube. Strong resonance are observed at two successive lengths 0.50m and 0.84 m above the surface of water. If the velocity of sound is 340 m/s, then the frequency of the tuning fork is

(a) 128 Hz

(b) 256 Hz

(c) 384 Hz

(d) 500 Hz

Ans: (d)

## In a resonance column experiment, the first resonance is obtained when the level of the water in the tube…

Q: In a resonance column experiment, the first resonance is obtained when the level of the water in the tube is at 20 cm from the open end. Resonance will also be obtained when the water level is at a distance of

(a) 40 cm from the open end

(b) 60 cm from the open end

(c) 80 cm from the open end

(d) 100 cm from the open end

Ans: (b)

## A closed organ pipe and an open organ pipe have their first overtones identical in frequency…

Q: A closed organ pipe and an open organ pipe have their first overtones identical in frequency. Their lengths are in the ratio

(a) 1 : 2

(b) 2 : 3

(c) 3 : 4

(d) 4 : 5

Ans: (c)