Questions in waves

Select	Question
	Which of the following statements is wrong
	The relation between frequency $n$ wavelength $\lambda$ and velocity of propagation $v$ of wave is
	Ultrasonic, Infrasonic and audible waves travel through a medium with speeds ${{V}_{u}},\,{{V}_{i}}$ and ${{V}_{a}}$ respectively, then
	The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is
	A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s, then wavelength of the tone emitted is
	A man sets his watch by a whistle that is 2 km away. How much will his watch be in error. (speed of sound in air 330 m/sec)
	When a sound wave of frequency 300 Hz passes through a medium the maximum displacement of a particle of the medium is 0.1 cm. The maximum velocity of the particle is equal to
	Sound waves have the following frequencies that are audible to human beings
	Velocity of sound waves in air is $330 m/sec$. For a particular sound in air, a path difference of $40 cm$ is equivalent to a phase difference of $1.6 \pi$. The frequency of this wave is
	The wavelength of ultrasonic waves in air is of the order of

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