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Natasha2012 [34]

3 years ago

8

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the freq

uency of the wave

1 answer:

nata0808 [166]3 years ago

7 0

Answer:

$f=1.98\times 10^5\ Hz$

Explanation:

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by :

$B=1.2\times 10^{-6}\sin [2\pi (\dfrac{z}{240}-\dfrac{10^7t}{8})]$ .....(1)

The general equation of the magnetic field wave is given by :

$B=B_o\sin (kz-\omega t)$ ....(2)

Equation (1) is in form of equation (2), if we compare equation (1) and (2) we find that,

$\omega=\dfrac{10^7}{8}$

We need to find the frequency of the wave. It is given by :

$f=\dfrac{\omega}{2\pi}\\\\f=\dfrac{10^7}{8\times 2\pi}\\\\f=1.98\times 10^5\ Hz$

So, the frequency of the wave is $1.98\times 10^5\ Hz$

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Why is the weight of the ruler not include in the calculation of moment?

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Answer:

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3 years ago

A +1.0 nC charge is at x = 0 cm, a -1.0 nC charge is at x = 1.0 cm and a 4.0 nC at x= 2 cm. What is the electric potential energ

lesantik [10]

Answer:

- 2.7 x 10^-6 J

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q1 = 1 nC at x = 0 cm

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q3 = 4 nC at x = 2 cm

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$U = U_{1,2}+U_{2,3}+U_{3,1}$

$U=\frac{Kq_{1}q_{2}}{0.01}+\frac{Kq_{2}q_{3}}{0.01}+\frac{Kq_{3}q_{1}}{0.02}$

$U=-\frac{9\times10^{9}\times 1\times10^{-9}\times 1\times10^{-9}}}{0.01}-\frac{9\times10^{9}\times 1\times10^{-9}\times 4\times10^{-9}}}{0.01}+-\frac{9\times10^{9}\times 1\times10^{-9}\times 4\times10^{-9}}}{0.02}$

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3 years ago

A 1.60 m tall person lifts a 2.10-kg book from the ground so it is 2.20 m above the ground. What is the potential energy of the

Viefleur [7K]

Answer:

Explanation:

Given

mass of book(m)=2.1 kg

height up to which book is lifted is (h)2.2 m

height of person $(h_0)1.6 m$

Potential energy of book relative to ground=mgh

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3 years ago

The energy levels of a particular quantum object are -11.7 eV, -4.2 eV, and -3.3 eV. If a collection of these objects is bombard

gogolik [260]

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Therefore the states of energy would be

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Middle :7.5eV

Highest: 8.4eV

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