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2 years ago

Sound wave of a wave length of 0.56 meters if its speed is 280 m/s what is the wave frequency

Physics

1 answer:

Reika [66]2 years ago

5 0

Answer:

500 Hz

Explanation:

Formula for finding wave frequency is,

f = c/λ

f = frequency

c = speed (m/s)

λ = wave length (m)

f = c/λ

f = 280/0.56

f = 500

∴ wave frequency is 500 Hz

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An AC voltage of the form Δv = 95 sin 275t where Δv is in volts and t is in seconds, is applied to a series RLC circuit. If R =

vovangra [49]

Answer:

(a) 83.06Ω

(b) 0.81A

Explanation:

Comparing Δv = 95 sin 275t with Δv = Vmaxsinωt

ω = 275

Inductive reactance Χ = ωL

= 275 × 0.240

= 66 Ω

Capacitive reactance Χ = 1/ωc

= 1/ (275 × 26 x 10^-6)

= 139.86Ω

Impedance Z = $\sqrt{R^{2} + (wL - \frac{1}{wc} )^{2}$

= $\sqrt{R^{2} + (X_{l} - X_{c} )^{2}$

= $\sqrt{38^{2} + (66 - 139.86)^{2}$

= 83.06Ω

(b) $I_{rms} = \frac{V_{rms}}{Z}$

solving for $V_{rms}$ ,

$V_{rms} = \frac{V_{max}}{\sqrt{2}}$

$V_{rms} = \frac{95}{\sqrt{2}}$

$V_{rms} = 67.2V$

substituting the value of $V_{rms}$ and Z into $I_{rms}$ equation, we have;

$I_{rms} = \frac{67.2}{83.06}$

$I_{rms} = 0.81A$

To get the average power, we first solve for ∅ since it was not given.

∅ $= tan^{-1}\frac{X_{l} - X_{c}}{R}$

∅ $= tan^{-1}\frac{66 - 139.86}{38}$

∅ $= tan^{-1}\frac{-73.86}{38}$

∅ $= tan^{-1} -1.9437$

∅ = -62.77°

Average power P = 0.81 × 67.2 × cos-62.77

P = 0.81 × 67.2 × 0.46

P = 25.03872W

P = 25.0W

7 0

3 years ago

Suppose that at point A the object traveled in a straight line at constant speed towards B'. In what direction must a force be a

777dan777 [17]

The answer is that

a would be going at a high speed and if b is just standing there then b would be getting applied forced on it so b would straight wherever a pushes it

Explanation:

5 0

2 years ago

Wyobraź sobie, że na swoje urodziny dostajesz wymarzony prezent. Opisz uczucia którę Cię ogarniają. Wykorzystaj przynajmniej trz

Gekata [30.6K]

Answer:

please tell it in english

8 0

2 years ago

Read 2 more answers

Which of the following affects the rate constant of a reaction?

Art [367]

A the entropy of the reaction I think ion know if that’s correct

3 0

1 year ago

The spectrum of a distant star shows that one in 2 e6 of the atoms of a particular element is in its first excited state 7.5 eV

Alchen [17]

Answer:

The temperature of star is 5473.87 K

Explanation:

Given:

Energy difference $\Delta E = 7.5$ eV

The ratio of number of particle $\frac{N_{f} }{N_{i} } = \frac{1}{2 \times 10^{6} }$

Degeneracy ratio $\frac{g_{f} }{g_{i} } = 4$

From the formula of boltzmann distribution for population levels,

$\frac{N_{f} }{N_{i} } =\frac{g_{f} }{g_{i} } e^{-\frac{\Delta E}{kT} }$

Where $k =$ boltzmann constant = $8.62 \times 10^{-5} \frac{eV}{K}$

$\frac{1}{2 \times 10^{6} } =4 e^{-\frac{7.5 eV}{8.62 \times 10^{-5} T} }$

$8 \times 10^{6} } = e^{\frac{7.5 eV}{8.62 \times 10^{-5} T} }$

$\ln(8 \times 10^{6}) = {\frac{7.5 eV}{8.62 \times 10^{-5} T} }$

$T = {\frac{7.5 eV}{8.62 \times 10^{-5} \ln(8 \times 10^{6})} }$

$T = 5473.87$ K

Therefore, the temperature of star is 5473.87 K

5 0

2 years ago