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2 years ago

Which statement describes a way electromagnetic waves are different from mechanical waves?

Physics

1 answer:

Goryan [66]2 years ago

7 0

a. Wrong. EM waves can travel through matter OR vacuum.

b. True, but so can mechanical waves.

c. Wrong. Waves transfer energy, not matter.

d. This is it. EM waves can travel through empty space, and mechanical waves can't.

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2 years ago

he capacitor can withstand a peak voltage of 550 VV . If the voltage source operates at the resonance frequency, what maximum vo

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Explanation:

Given that,

Voltage = 550 V

Suppose, In an L-R-C series circuit, the resistance is 400 ohms, the inductance is 0.380 Henry, and the capacitance is $1.20\times10^{-2}\mu F$

We need to calculate the resonant frequency

Using formula of resonant frequency

$f=\dfrac{1}{2\pi\sqrt{LC}}$

Put the value into the formula

$f=\dfrac{1}{2\pi\sqrt{0.380\times1.20\times10^{-8}}}$

$f=2356.8\ Hz$

We need to calculate the maximum current

Using formula of current

$I=\dfrac{V_{c}}{X_{c}}$

$I=2\pi f C\times V_{c}$

Put the value into the formula

$I=2\pi\times2356.8\times1.20\times10^{-8}\times550$

$I=0.0977\ A$

We need to calculate the impedance of the circuit

Using formula of impedance

$Z=\sqrt{R^2+(X_{L}-X_{C})^2}$

At resonant frequency , $X_{L}=X_{C}$

So, Z = R

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Using formula of voltage

$V=IR$

Put the value into the formula

$V=0.0977\times400$

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Hence, The maximum voltage is 39.08 V.

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2 years ago