Recent questions tagged q118

If $U_{rms} is\; 30 R^{\large\frac{1}{2}}\; at \;27^{\large\circ}$ then the molar mass of the gas in kg is

asked Mar 3, 2014 by sharmaaparna1

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Which of the following is purified by vacuum distillation ? (i) Glycerine (ii) Glycerol (iii) propane 1,2,3- triol (iv) Ethanol

asked Feb 28, 2014 by meena.p

1 answer

What could be the major product in the below reaction

asked Feb 27, 2014 by sreemathi.v

1 answer

Find the equation of chord of contact for hyperbola $\large\frac{x^2}{a^2}-\frac{y^2}{b^2}$$=1$?

asked Feb 10, 2014 by sreemathi.v

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If in an AP $m$ times $\;m^{th}\;$ term equals $n$ times $\;n^{th}$ term , then $\;(m+n)^{th}$ term will be

asked Jan 21, 2014 by yamini.v

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With what velocity must an electron travel so that its momentum is equal to that of a photon of wavelength $\lambda=5200A^{\large\circ}$?

asked Jan 16, 2014 by sreemathi.v

1 answer

If $\overrightarrow a=(-1,1,1)\:\:\overrightarrow b=(2,0,1)\:and\:\overrightarrow x$ is vector such that $\overrightarrow x.\overrightarrow a=7,\:\overrightarrow x.\overrightarrow b=0$ and $\overrightarrow a,\overrightarrow b,\overrightarrow x$ are coplanar, then $\overrightarrow x=?$

asked Jan 7, 2014 by rvidyagovindarajan_1

1 answer

Find $\lim\limits_{x\to 0}\{\tan(\large\frac{\pi}{4}$$+x)\}^{1/x}$

asked Dec 31, 2013 by sreemathi.v

1 answer

$I= \int \limits_0^{\frac{\pi}{2}} \sin ^2 x dx $ find the value of I

asked Dec 20, 2013 by meena.p

1 answer

The two sub units of ribosomes remain united at a critical ion level of :

asked Dec 18, 2013 by thanvigandhi_1

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The surface of a metal has work function 2.66 e V. This is illuminated with photons of wavelength 450 nm. Te de Broglie wavelength of the emitted photoelectrons is : ( Mass of electron = $9 \times 10^{-31}$ kg)

asked Nov 18, 2013 by thanvigandhi_1

1 answer

When a light of photons of energy 4.2 eV is incident on a metallic sphere of radius 10 cm and work function 2.4 eV , photoelectrons are emitted. The number of photoelectrons liberated before the emission is stopped , is $(e=1.6 \times 10^{-19}C\: and \: \large\frac{1}{4 \pi \varepsilon_{\circ}} = 9 \times 10^9\: N-m^2/Coulomb^2)$ :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

An X-ray tube produce a continuous spectrum of radiation with its shortest wavelength of $45 \times 10^{-2} A^{\circ}$. The maximum energy of a photon in the radiation in $eV$ is $(h=6.62 \times 10^{-34} \;J-sec, c= 3 \times 10^8 m/sec)$

asked Oct 20, 2013 by meena.p

1 answer

A long straight wire along the Z-axis carries a current 'I' in the negative Z-direction . The induced magnetic field B at a point having coordinates (x,y) is

asked Oct 20, 2013 by thanvigandhi_1

1 answer

Two persons A and B are located in X-Y plane at the points at the points (0,0) and (0,10) respectively. (The distance are measured in MKS units). At a time $t=0$, they start moving simultaneously with velocities $\bar {v}_A=2 \hat j m/s$ and $\bar v_B=2 \hat i m/s$ respectively. The time after which A and B are at their closest distance is :

asked Oct 14, 2013 by meena.p

1 answer

A 0.01 H inductor and $ \sqrt 3\: \pi\: ohm$ resistance are connected in series with a 220 V, 50 Hz AC source. The phase difference between the current and emf is

asked Oct 12, 2013 by thanvigandhi_1

1 answer

Photoelectric emission is observed from a metallic surface for frequencies $v_1$ and $v_2$ of the incident light $(v_1 > v_2)$. If the maximum values of kinetic energy of the photo electrons emitted in the two cases are in the ratio $1:n$, then the threshold frequency of the metallic surface is :

asked Oct 1, 2013 by meena.p

1 answer

Match the following and find the correct pairs:

asked Sep 24, 2013 by meena.p

1 answer

A $U^{235}$ nuclear reactor generates energy at a rate of $3.70 \times 10^7\; J/s$ Each fission liberates $185\;MeV$ useful energy. If the reactor has to operate for $144 \times 10^4$ seconds, then the mass of the fuel needed is (Assume Avogadro's number $=6 \times 10^{23} \;mol^{-1},1 eV=1.6 \times 10^{-19}\;J)$

asked Sep 18, 2013 by meena.p

1 answer

In the multiplicative group of cube root of unity, the order of $w^{2}$ is

asked May 24, 2013 by poojasapani_1

1 answer

One of the foci of the rectangular hyperbola $xy=18$ is

asked May 14, 2013 by poojasapani_1

1 answer

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