Radiations of intensity $0.5\,\,W/{m^2}$ are striking a metal plate. The pressure on the plate is
$0.166 \times {10^{ - 8}}\,N/{m^2}$
$0.332 \times {10^{ - 8}}\,N/{m^2}$
$0.111 \times {10^{ - 8}}\,N/{m^2}$
$0.083 \times {10^{ - 8}}\,N/{m^2}$
In an electromagnetic wave, at an instant and at a particular position, the electric field is along the negative $z$-axis and magnetic field is along the positive $x$-axis. Then the direction of propagation of electromagnetic wave is
The monoenergetic beam of electrons moving along $+ y$ direction enters a region of uniform electric and magnetic fields. If the beam goes straight undeflected, then fields $B$ and $E$ are directed respectively along
Which of the following statement is false for the properties of electromagnetic waves ?
In a plane electromagnetic wave, which of the following has/ have zero average/value in one complete cycle?
$(a)$ Magnetic field
$(b)$ Magnetic energy
$(c)$ Electric field
$(d)$ Electric energy
The electric field associated with an em wave in vacuum is given by $\vec{E}=\hat{i} 40 \cos \left(k z-6 \times 10^{8} t\right)$ where $E, x$ and $t$ are in $volt/m,$ meter and seconds respectively. The value of wave vector $k$ is....$ m^{-1}$