How many vocal cords does a person have? a.3 b.1 c.2 d.5

Explanation:

A solid sphere moves through a liquid. The liquid opposes the motion of the sphere with a force F which depends on the radius r, speed v of the correct sphere and coefficient of viscosity η of the liquid. The correct relationship between these physical quantities

Answer:

c.column matrix

Explanation:

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Answer:

b.660 Hz

Explanation:

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Answer:

answer is b from this

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Answer:

[tex]\qquad\qquad\qquad\boxed{ \bf{ \:(b) \: \: \: 2 \: \: }} \\ \\ [/tex]

Explanation:

Given that,

[tex]\qquad\sf \: {(1 + i)}^{2n} = {(1 - i)}^{2n} \\ \\ [/tex]

can be further rewritten as

[tex]\qquad\sf \: \dfrac{{(1 + i)}^{2n}}{{(1 - i)}^{2n}} = 1 \\ \\ [/tex]

[tex]\qquad\sf \: {\bigg(\dfrac{1 + i}{1 - i} \bigg) }^{2n} = 1 \\ \\ [/tex]

On rationalizing the denominator, we get

[tex]\qquad\sf \: {\bigg(\dfrac{1 + i}{1 - i} \times \dfrac{1 + i}{1 + i} \bigg) }^{2n} = 1 \\ \\ [/tex]

[tex]\qquad\sf \: {\bigg(\dfrac{(1 + i)^{2} }{ {1}^{2} - {i}^{2} } \bigg) }^{2n} = 1 \\ \\ [/tex]

[tex]\qquad\boxed{ \sf{ \: \because \: (x + y)(x - y) = {x}^{2} - {y}^{2} \: }} \\ \\ [/tex]

[tex]\qquad\sf \: {\bigg(\dfrac{ {1}^{2} + {i}^{2} + 2i}{ 1 - ( - 1) } \bigg) }^{2n} = 1 \: \: \: \: \boxed{ \sf{ \: \because \: {i}^{2} = - 1 \: }}\\ \\ [/tex]

[tex]\qquad\boxed{ \sf{ \: \because \: {(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy \: }} \\ \\ [/tex]

[tex]\qquad\sf \: {\bigg(\dfrac{ 1 - 1+ 2i}{2 } \bigg) }^{2n} = 1 \: \: \: \: \boxed{ \sf{ \: \because \: {i}^{2} = - 1 \: }}\\ \\ [/tex]

[tex]\qquad\sf \: {\bigg(\dfrac{ 2i}{2 } \bigg) }^{2n} = 1 \: \\ \\ [/tex]

[tex]\qquad\sf \: {(i)}^{2n} = 1 \: \\ \\ [/tex]

[tex]\qquad\sf \: {(i)}^{2n} = {(i)}^{4} \: \\ \\ [/tex]

[tex]\qquad\sf \: 2n = 4 \: \\ \\ [/tex]

[tex]\qquad\sf\implies \sf \: n = 2 \: \\ \\ [/tex]