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Recent questions tagged q181

Pure $O_2$ diffuses through an aperture in 224 seconds whereas mixture of $O_2$ and another gas containing $80\%\;O_2$ diffuses from the same in 234 sec. What is mol. wt. of gas?

asked Apr 5, 2014 by sharmaaparna1

1 answer

The following is the percentage composition of a compound. $Na = 16.08 \%, C = 4.19 \%, O = 16.78 \%$ and $H_2O = 62.95 \%$ . Its molecular formula is

asked Mar 5, 2014 by meena.p

1 answer

Rutherford proposed the atomic model after his most striking experiment on $\alpha$– scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. Calculate the angular momentum of electron in 2p orbital is

asked Feb 8, 2014 by sharmaaparna1

1 answer

If $a_{n}=\displaystyle\sum_{k=1}^{n}\;\large\frac{1}{k(n+1-k)}$, then for $n\;\geq\;2$

asked Jan 23, 2014 by yamini.v

1 answer

If $\alpha,\beta$ are roots of $ax^2+bx+c=0$ then $\lim\limits_{x\to \alpha}\large\frac{1-\cos(ax^2+bx+c)}{(x-\alpha)^2}$ is

asked Jan 6, 2014 by sreemathi.v

1 answer

Integrate : $\int \sqrt{\large\frac{x}{1+x}}$$dx$

asked Dec 30, 2013 by meena.p

1 answer

Bacterial leaf blight of rice is caused by a species of :

asked Dec 21, 2013 by thanvigandhi_1

0 answers

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