Stationary Waves

The harmonics which are present in a pipe open at one end are,

• Odd harmonics

• Even harmonics

• Odd and even harmonics

• All the harmonics

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

• 1:2

• 2:3

• 3:4

• 4:5

The frequency of fundamental note emitted by a string of length l clamped at both ends is, (v = velocity of sound in string) 

• v/l

• 2v/l

• v/2l

• v/4l

Air is blown at the mouth of a tube (Length 25 cm and diameter 3 cm) closed at one end. Velocity of sound is 330 m/s. The sound which is produced will correspond to the frequencies,

• 330 Hz

• Combination of frequencies 330, 990, 1650, 2310, Hz

• Combination of frequencies 330, 660, 990, 120, 1650 Hz

• Combination of frequencies 660, 1320, 1980, 2640, 3300 Hz

Transverse wave are generated in two uniform steel wires A and B by attaching their free end to a vibrating source of frequency 500 Hz. The diameter of wire A is half that of wire B and the tension on wire A is half that on wire B. What is ratio of the velocity of waves in wires A and B?

• 1:2

• 2:1

A tuning fork of frequency 480 Hz is in unison with the first overtone of a pipe closed at one end. What is the fundamental frequency of the closed pipe?

• 120 Hz

• 140 Hz

• 150 Hz

• 160 Hz

A sonometer wire is unison with a tuning fork. Keeping the same tension, the length of the wire between the bridges is doubled. The tuning fork can still be in resonance with the wire, provided the wire now vibrates in,

• 6 segments

• 4 segments

• 3 segments

• 2 segments

In a stationary wave, every particle performs,

• a S.H.M. at all points

• a S.H.M. at all points except nodal points

• a S.H.M. at all points except antinodal points

• a S.H.M. at all points with constant amplitude

A tuning fork vibrating with a sonometer having 20 cm wire produces 5 beats per second. The beat frequency does not change if the length of the wire is changed to 21 cm. the frequency of the tuning fork (in Hz) must be

• 200

• 210

• 205

• 215

A closed organ pipe (closed at one end) is excited so as to support the third overtone. It is then found that there are in the pipe,

• Four nodes and four antinodes

• Three nodes and four antinodes

• Four nodes and three antinodes

• Three nodes and three antinodes