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Recent questions tagged atomic-structure

The study of photoelectric effect is useful in understanding :

asked Jan 10, 2014 by sreemathi.v

1 answer

Which of the following does not characterized X-rays?

asked Jan 10, 2014 by sreemathi.v

1 answer

A photon of 300nm is observed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm, the wavelength of second re-emitted photon is

asked Jan 10, 2014 by sreemathi.v

1 answer

Suppose $10^{-17}J$ of light energy is needed by the interior of human eye to see an object .The photons of green light ($\lambda =550nm)$ needed to see the object are :

asked Jan 10, 2014 by sreemathi.v

1 answer

The maximum sum of the number of neutrons and protons in an isotope of hydrogen is

asked Jan 10, 2014 by sreemathi.v

1 answer

The ratio between the neutrons present in carbon and silicon with respect to mass number of 12 and 28 respectively is

asked Jan 10, 2014 by sreemathi.v

1 answer

The total number of fundamental particles in one atom of $_6 C ^{14}$ is

asked Jan 10, 2014 by sreemathi.v

1 answer

For which of the following process energy is absorbed?

asked Jan 9, 2014 by sreemathi.v

1 answer

Heavy water molecule made from $_2 H ^3$ and $O ^{18}$ has a molecular weight of

asked Jan 9, 2014 by sreemathi.v

1 answer

The ratio of specific charge (e/m) of a proton to that of an $\alpha$-particle is :

asked Jan 9, 2014 by sreemathi.v

1 answer

The pair having identical value of $\large\frac{e}{m}$:

asked Jan 9, 2014 by sreemathi.v

1 answer

Find the wave length of radiation required to excite the electron in ground level of $Li^{++}(z=3)$ to third energy level.Also find the ionization energy of $Li^{2+}$.(R=$1.097\times 10^7m^{-1})$

asked Jan 9, 2014 by sreemathi.v

1 answer

Calculate the wave length of light radiation that would be emitted,when an electron in the fourth Bohr's orbit of $He^+$ ion falls to the second Bohr's orbit.To what transition does this light radiation correspond in the H-atom?

asked Jan 9, 2014 by sreemathi.v

1 answer

A spectral line in the spectrum of $H$-atom has a wave number of $15222.22cm^{-1}$. What transition is responsible for this radiation? (Rydberg constant $R=1.096\times 10^5cm^{-1}$)

asked Jan 9, 2014 by sreemathi.v

1 answer

Estimate the wavelength of second line (also called as $\beta$-line) in Balmer series of hydrogen atom

asked Jan 9, 2014 by sreemathi.v

1 answer

A hydrogen atom in the ground state is hit by a particle exciting the electron to 4s orbital.The electron then drops to 2s orbital.What is the frequency of radiation emitted and absorbed in the process?

asked Jan 9, 2014 by sreemathi.v

1 answer

Determine the frequency of revolution of the electron in $2^{nd}$ Bohr's orbit in hydrogen atom

asked Jan 9, 2014 by sreemathi.v

1 answer

Calculate the velocity of electron ejected from platinum surface when radiation of 200nm fall on it. Work function of platinum is 5eV. $(1eV=1.6\times 10^{-19}J$)

asked Jan 9, 2014 by sreemathi.v

1 answer

A 100W power source emits green light at a wavelength $\lambda=5000\overset{\circ}{A}$. How many photons per minute are emitted by the source?

asked Jan 9, 2014 by sreemathi.v

1 answer

Given the $\lambda$ values for violet light ($\lambda=4.10\times 10^{-5}cm)$ and red light($\lambda=6.56\times 10^{-5}cm$), which of the following is true about the ratio of energies carried by them and their frequencies?

asked Jan 9, 2014 by sreemathi.v

1 answer

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