Recent questions tagged unit2

Calculate the maximum wavelength in $A^{\large\circ}$ a photon that can initiate the reaction. $Cl_2(g)\rightarrow 2cl(g), \bigtriangleup H = 247$ KJ/mol

asked Feb 6, 2014 by sharmaaparna1

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Sodium atom emits light with a wavelength of 330nm when an electron moves from a 4p orbital to a 3s orbital. what is the energy difference between the orbitals in KJ/mol?

asked Feb 6, 2014 by sharmaaparna1

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An argon laser emits blue light with a wavelength of 488.0nm. How many photon are emitted by this laser in 2.00 sec,operating a power of 515 milliwatts?(one watt = 1J$S^{-1}$)

asked Feb 6, 2014 by sharmaaparna1

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The energy required for the ionisation of a certain atom is $3.44\times10^{-18}J$. The absorption of a photon of unknown wavelength ionises the atom and ejects an electron with velocity $1.03\times10^6$ m/sec. Calculate the wavelength of the incident radiation.

asked Feb 5, 2014 by sharmaaparna1

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Calculate the wavelength of the first line and the series limit for the Lyman series for hydrogen.(Series limit is for the case when $n_2 = \infty)$

asked Feb 5, 2014 by sharmaaparna1

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An electron difraction experiment was performed with a beam of electrons accelerated by a potential difference of 10.0kV.What is the wavelength of the electron beam?(1KV = 1000V = 1000eV for the electron)

asked Feb 5, 2014 by sharmaaparna1

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A proton is accelerated to one tenth of the velocity of light. Suppose velocity can be measured with a precision of $\pm1\%$, what can be the uncertainity in its position?

asked Feb 5, 2014 by sharmaaparna1

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The speed of a certain proton is $4.5\times10^5m$ If the uncertainity is to be reduced to 0.01percent, what uncertainity in its location must be tolerated?

asked Feb 5, 2014 by sharmaaparna1

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Two particles A and B are in motion . if the wavelength associated with particle A is $5\times10^{-8}$m.Calculate the wavelength associated with particle B if its momentum is half of A.

asked Feb 5, 2014 by sharmaaparna1

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Calculate the wavelength of a helium atom whose speed is equal to root mean square speed at 293 K $(rms = \sqrt{3RT/m})$

asked Feb 4, 2014 by sharmaaparna1

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The wavelength of $\beta$ line of the Balmer Series is $4815 A^{\large\circ}$. What is the wavelength of $\alpha$ line of balmer Series of the same atom?

asked Feb 4, 2014 by sharmaaparna1

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AIR services on vividh Bharti is transmitted on 219m band.What is its transmission frequency in Hertz.

asked Feb 4, 2014 by sharmaaparna1

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A certain laser transition emits $6.37\times10^{15}$ quants per second per square meter. Calculate the power out put in joule per square metre per second. Given $\lambda$ = 632.8 nm.

asked Feb 4, 2014 by sharmaaparna1

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A photon of 300nm is absorbed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm. Calculate energy of other photon re-emitted out.

asked Feb 4, 2014 by sharmaaparna1

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The dissociation energy of $H_2$ is 430.53 KJ$mol^{-1}$. If $H_2$ is exposed to radiation energy of wavelength 253.7nm, what % of radiant energy will be converted into kinetic energy ?

asked Feb 1, 2014 by sharmaaparna1

1 answer

A certain dye absorbs light of $\lambda = 4530 A^{\large\circ}$ and then fluorescence light of $5080 \;A^{\large\circ}$ Assuming that under given conditions $47\%$ of the absorbed energy is re-emmited out as fluorescence, Calculate the ratio of Quantum emitted out to the no. of quanta absorbed

asked Feb 1, 2014 by sharmaaparna1

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$O_2$ undergoes photochemical dissociation into one normal oxygen atom and one oxygen atom, 1.967 eV more energetic than normal. The dissociation of $O_2$ into two normal atoms of oxygen requires 498 KJ$mol^{-1}$.what is the maximum wavelength effective for photochemical dissociation of $O_2$ ?

asked Feb 1, 2014 by sharmaaparna1

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Atomic radius is of the order of $10^{-8} cm$ and nuclear radius is of the order of $10^{-13}$ cm. calculate what fraction of atom is occupied by nucleus?

asked Jan 31, 2014 by sharmaaparna1

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Find out the energy of H atom in first excitation state. The value of permitivity factor $4\pi E_{\large\circ} = 1.11264\times10^{-10} C^2N^{-1}m{-2}$

asked Jan 31, 2014 by sharmaaparna1

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What hydrogen like ion has the wavelength difference between the first lines of Balmer and Lyman series equal to 59.3 nm? $R_H = 109678 cm^{-1}$

asked Jan 31, 2014 by sharmaaparna1

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The photo electric emission requires a threshold frequency $V_o$. For a certain metal $\lambda_1$ = 2200 $\overset{\circ}{A}$ and $\lambda_2$ = 1900 $\overset{\circ}{A}$ produce electrons with a maximum kinetic energy $KE_1$ and $KE_2$. If $KE_2 = 2KE_1$. Calculate $V_o$ and corresponding $\lambda_o$.

asked Jan 30, 2014 by sharmaaparna1

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Calculate the largest wavelength which can remove the electron from 1 Bohr's orbit. Given $E_1$ = 13.6 eV

asked Jan 30, 2014 by sharmaaparna1

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To what series does the spectral lines of atomic hydrogen belong if its wave number is equal to the difference between the wave numbers of the following two lines of the Balmer series 486.1 and 410.2 nm?

asked Jan 28, 2014 by sharmaaparna1

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A series of lines in the spectrum of atomic H lies at wavelengths 656.46 , 486.27 , 434.17 , 410.29 mm. what is the wavelength of next line in this series?

asked Jan 28, 2014 by sharmaaparna1

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A hydrogen like atom (atomic No. Z) is in a higher excited state of quantam number n. This excited atom can make a transition to the first excited state by successively emitting two photons of energies 10.20 eV and 17.00 eV respectively. alternatively the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energy 4.25eV and 5.95 eV respectively. Determine the values of n and Z.

asked Jan 28, 2014 by sharmaaparna1

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A compound of Vanadium has a magnetic moment of 1.73 Bm. Work out the electric configuration of the Vanadium ion in the compound.

asked Jan 28, 2014 by sharmaaparna1

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If the electron energy is -3.4 eV , Find the principal quantum number of H-atom?

asked Jan 24, 2014 by sharmaaparna1

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An ion $Mn^{a+}$ has the magnetic moment equal to 4.9bm. What is the value of a ?

asked Jan 24, 2014 by sharmaaparna1

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An oil drop has $8.01\times10^{-19}$ C charge. Calculate the number of electrons in this drop.

asked Jan 23, 2014 by sharmaaparna1

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The wavelength of $m^{th}$ line Balmer series for an orbital is $4103 A^{\large\circ}$. What is the value of $m$?

asked Jan 23, 2014 by sharmaaparna1

1 answer