In a Franck-Hertz experiment,an electron of e | vedclass

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(D) The energy lost by the electron during the collision with the mercury atom is given by the difference in its initial and final kinetic energies.En

Vedclass · Accepted Answer

$250$

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(D) The energy lost by the electron during the collision with the mercury atom is given by the difference in its initial and final kinetic energies.Energy lost,$\Delta E = 5.6 \ eV - 0.7 \ eV = 4.9 \ eV$.This energy is absorbed by the mercury atom,which then emits a photon when it de-excites. The energy of the emitted photon is $E = 4.9 \ eV$.The relationship between the energy of a photon and its wavelength $\lambda$ is given by $\lambda = \frac{hc}{E}$.Using the approximation $hc \approx 1240 \ eV \cdot nm$,we have:$\lambda = \frac{1240 \ eV \cdot nm}{4.9 \ eV} \approx 253 \ nm$.Rounding to the nearest given option,the value is $250 \ nm$.

List-$I$	List-$II$
$1$. Nitrogen molecules	$(A)$ Continuous spectrum
$2$. Incandescent solids	$(B)$ Absorption spectrum
$3$. Fraunhofer lines	$(C)$ Band spectrum
$4$. Electric arc between iron rods	$(D)$ Emission spectrum

$1$. Burning candle	$i$. Line spectrum
$2$. Sodium vapour	$ii$. Continuous spectrum
$3$. Bunsen flame	$iii$. Band spectrum
$4$. Dark lines in solar spectrum	$iv$. Absorption spectrum

In a Franck-Hertz experiment,an electron of energy $5.6 \ eV$ passes through mercury vapour and emerges with an energy $0.7 \ eV$. The minimum wavelength of photons emitted by mercury atoms is close to ............. $nm$.

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Match the appropriate pairs from List-$I$ and List-$II$:
List-$I$ List-$II$
$1$. Nitrogen molecules $(A)$ Continuous spectrum
$2$. Incandescent solids $(B)$ Absorption spectrum
$3$. Fraunhofer lines $(C)$ Band spectrum
$4$. Electric arc between iron rods $(D)$ Emission spectrum

$Assertion :$ $A$ tube light emits white light.
$Reason :$ Emission of light in a tube takes place at a very high temperature.

Match the following:
$1$. Burning candle $i$. Line spectrum
$2$. Sodium vapour $ii$. Continuous spectrum
$3$. Bunsen flame $iii$. Band spectrum
$4$. Dark lines in solar spectrum $iv$. Absorption spectrum

An electron of a stationary hydrogen atom transitions from the fifth energy level to the ground level. The velocity that the atom acquires as a result of photon emission will be:

Line spectrum contains information about

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