What is the energy of photon whose wavelength is $6840\,\mathop A\limits^o $ ?......$eV$
What is the energy of photon whose wavelength is $6840\,\mathop A\limits^o $ ?......$eV$
- [AIIMS 2007]
- A
$1.81$
- B
$3.6$
- C
$-13.6$
- D
$12.1$
Similar Questions
If a photon has velocity $c$ and frequency $\nu$, then which of following represents its wavelength
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- [AIPMT 1996]
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- [AIPMT 2004]
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$(a)$ Estimate the speed with which electrons emitted from a heated emitter of an evacuated tube impinge on the collector maintained at a potential difference of $500\;V$ with respect to the emitter. Ignore the small inttial speeds of the electrons. The specific charge of the electron, $i.e.$, the $e / m$ is glven to be $1.76 \times 10^{11}\; C\; kg ^{-1}$
$(b)$ Use the same formula you employ in $(a)$ to obtain electron speed for an collector potential of $10 \;MV$. Do you see what is wrong? In what way is the formula to be modified?
$(a)$ Estimate the speed with which electrons emitted from a heated emitter of an evacuated tube impinge on the collector maintained at a potential difference of $500\;V$ with respect to the emitter. Ignore the small inttial speeds of the electrons. The specific charge of the electron, $i.e.$, the $e / m$ is glven to be $1.76 \times 10^{11}\; C\; kg ^{-1}$
$(b)$ Use the same formula you employ in $(a)$ to obtain electron speed for an collector potential of $10 \;MV$. Do you see what is wrong? In what way is the formula to be modified?