### Class XI

in longitudinal waves, the constituents of the medium
1. oscillate perpendicular to the direction of wave propagation
2. oscillate at 40∘∘ to the direction of wave propagation
3. oscillate at 30∘∘ to the direction of wave propagation
4. oscillate along the direction of wave propagation.
A stretched string resonates with tuning fork frequency 512 Hz when length of the string is 0.5 m. The length of the string required to vibrate resonantly with a tuning fork of frequency 256 Hz would be
1. 0.25 m
2. 0.5 m
3. 2 m
4. 1 m
The speed of propagation of a sinusoidal wave is given by V=νλV=νλ where
1. νν is the reciprocal of the period and λλ is the wave number
2. νν is the reciprocal of the period and λλ is the dispersion
3. νν is the angular frequency and λλ is the wavelength
4. νν is the reciprocal of the period and λλ is the wavelength
A string when stretched with a weight of 9 kg. weight produces a note of frequency 256 Hz. The weight required to produce an octave of the note is
1. 4 kg wt.
2. 36 kg wt.
3. 9/4 kg wt.
4. 18 kg wt.
If y(x, t) = a sin (kx + ωωt + φφ ) represents a wave function then ‘ωω’ is
1. the angular frequency
2. the period
3. the phase
4. the wave number
0
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