The photon energy in units of $eV$ for electromagnetic wave of wavelength $2\,cm$ is
The photon energy in units of $eV$ for electromagnetic wave of wavelength $2\,cm$ is
- A
$2.5 \times 10^{-19}$
- B
$5.2 \times 10^{16}$
- C
$3.2 \times 10^{-16}$
- D
$6.2 \times 10^{-5}$
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A velocity selector consists of electric field $\overrightarrow{ E }= E \hat{ k }$ and magnetic field $\overrightarrow{ B }= B \hat{ j }$ with $B =12 mT$.
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(Given, , ass of electron $=9.1 \times 10^{-31} kg$ )
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The value $E$ required for an electron of energy $728 eV$ moving along the positive $x$-axis to pass undeflected is:
(Given, , ass of electron $=9.1 \times 10^{-31} kg$ )
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