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Bohr's Postulates

A small sourc...

Question

A small source of sound moves on a circle as shown in the figure and an observer is standing on O. let $n_{1}, n_{2}$ and $n_{3}$ be the frequencies heard when the source is at A, B and C respectively . Then

A

n_{1} > n_{2} > n_{3}

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B

n_{2} > n_{3} > n_{1}

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C

n_{1} = n_{2} > n_{3}

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D

n_{2} > n_{1} > n_{3}

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Solution

The correct option is B $n_{2} > n_{3} > n_{1}$
At point A, source is moving from observer so $n_{1} < n$
At point C, source is perpendicular to observer so $n_{3} = n$
At point B, source is coming towards observer so $n_{2} > n$
$∴ n_{2} > n_{3} > n_{1}$ {B|

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Similar questions

5 < n_{1} < n_{2} < n_{3} < n_{4}

be integers such that

n_{1} + n_{2} + n_{3} + n_{4} = 35

. The number of such distinct arrangements

(n_{1}, n_{2}, n_{3}, n_{4})

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n_{1} < n_{2} < n_{3} < n_{4} < n_{5}

be positive such that

n_{1} + n_{2} + n_{3} + n_{4} + n_{5} = 20

. The numbers of such distinct arrangements

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C_{1}, C_{2}, C_{3}

.....represent the speeds of

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{(\frac{n_{1} C_{1}^{2} + n_{2} C_{2}^{2} + n_{3} C_{1}^{3} + \dots}{n_{1} + n_{2} + n_{3} + \dots})}^{\frac{1}{2}}

\frac{(n_{1} C_{1}^{2} + n_{2} C_{2}^{2} + n_{3} C_{1}^{3} + \dots)^{\frac{1}{2}}}{n_{1} + n_{2} + n_{3} + \dots}

\frac{(n_{1} C_{1}^{2})^{\frac{1}{2}}}{n_{1}} + \frac{(n_{2} C_{2}^{2})^{\frac{1}{2}}}{n_{2}} + \frac{(n_{3} C_{1}^{3})^{\frac{1}{2}}}{n_{3}} + \dots

{[\frac{(n_{1} C_{1}^{2} + n_{2} C_{2}^{2} + n_{3} C_{1}^{3} + \dots]^{2}}{(n_{1} + n_{2} + n_{3} + \dots)}]}^{\frac{1}{2}}

n_{1} < n_{2} < n_{3} < n_{4} < n_{5}

be positive integers such that

n_{1} + n_{2} + n_{3} + n_{4} + n_{5} = 20

. Then the number of such distinct arrangements

(n_{1}, n_{2}, n_{3}, n_{4}, n_{5})

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n_{1} < n_{2} < n_{3} < n_{4} < n_{5}

be positive integers such that

n_{1} + n_{2} + n_{3} + n_{4} + n_{5} = 20

. Then the number of such distinct arrangements

(n_{1}, n_{2}, n_{3}, n_{4}, n_{5})

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