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NEET 2009

Exam: NEET
Year: 2009
Subject: Physics
Chapter: Waves and Sound

NEET 2009 · Physics · Waves and Sound

A wave in a string has an amplitude of 2 ~cm . The wave travels in...

A wave in a string has an amplitude of

2 \mathrm{~cm}

. The wave travels in the +ve direction of

\mathrm{x}

-axis with a speed of

128 \mathrm{~m} / \mathrm{s}

and it is noted that 5 complete waves fit in

4 \mathrm{~m}

length of the string. The equation describing the wave is

Options

A $y=(0.02) m \sin (7.58 x-1005 t)$
B $y=(0.02) \mathrm{m} \sin (7.85 x+1005 \mathrm{t})$
C $y=(0.02) m \sin (15.7 x-2010 t)$
D $y=(0.02) m \sin (15.7 x+2010 t)$

Correct answer

A. $y=(0.02) m \sin (7.58 x-1005 t)$

Step-by-step solution

5 \lambda=4

\lambda=

\frac{4}{5} \mathrm{k}=\frac{2 \pi}{\lambda}=\frac{10 \pi}{4}=

7.85 wave moves along positive

\mathrm{X}

-direction

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