Answer to Question #180854 in Electricity and Magnetism for passout

Question

Discuss Poynting vector related to power flow in free space. A uniform plane wave at frequency of 200 MHz travel in vacuum along positive Y direction. The electric field at some instance is given as  . Find the phase constant of the wave.

Answer 1

To be given in question

Frequency n=200MHz

Wave move y direction

To be asked in question

Phase constant of wave = ?

We know that

Plane wave equation

$E=E_{0}sin(wt-ky) j$

$(wt-ky)=\phi =phase angle$

$(2\pi\times 200\times10^6t -ky)=\phi$

$(4\pi\times10^8t-ky)=\phi$ $\rightarrow(1)$

equation (1) is called phase constant

Phase constant varring with respect time