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Recent questions tagged q81

Two photons of energy $2.5 \;eV$ and $3.6\;eV$ fall on a metal surface of work function $1.5\;eV$. The ratio of the maximum velocities of the photo electrons emitted from the metal surface is :

asked Sep 23, 2013 by meena.p

1 answer

If $E,M,J$ and $G$ respectively denote energy , mass, angular momentum and universal gravitational constant, the quantity, which has the same dimensions as the dimension of $\large\frac{EJ^2}{M^5G^2}$

asked Sep 17, 2013 by meena.p

1 answer

A sphere of mass M and radius $R_2$ has a concentric cavity of radius $R_1$ as shown. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as $(0 < r < \alpha)$

asked Aug 30, 2013 by meena.p

1 answer

A pendulum bob of mass m carying a charge 'q' is at rest with its string making an angle $\theta$ with the vertical in a uniform horizontal electric field E. The tension in the string

asked Aug 7, 2013 by meena.p

1 answer

Two cars of unequal masses use similar tyres if they are moving at same initial speed. the minimum stopping distance

asked Jul 12, 2013 by meena.p

1 answer

The integrating factor of $dx+xdy=e^{-y}\sec^{2}y dy$ is

asked May 22, 2013 by poojasapani_1

1 answer

If $\omega$ is a cube root of unity then the value of $(1-\omega+\omega^{2})^{4}+(1+\omega-\omega^{2})^{4}$ is

asked May 13, 2013 by poojasapani_1

1 answer

Evaluate:$\int\limits_0^ \pi \large\frac{xdx}{a^2\cos^2x+b^2\sin^2x}$

asked Feb 4, 2013 by meena.p

1 answer

Use differentials to evaluate $ \bigg(\large\frac{17}{81}\bigg)^{1/4}$ approximately.

asked Jan 30, 2013 by meena.p

0 answers

Eight coins are tossed together.The probability of getting exactly 3 heads is

asked Jan 10, 2013 by sreemathi.v

1 answer

If $x=\sin t$ and $y=\sin pt$, prove that $(1-x^2)\large \frac{d^2y}{dx^2}$$-x\large\frac{dy}{dx}+\normalsize p^2y=0$

asked Jan 2, 2013 by sreemathi.v

1 answer

In applying one or more row operations while finding $A^{-1}$ by elementary row operations, we obtain all zeros in one or more, then $A^{-1}$________ .

asked Dec 24, 2012 by sreemathi.v

1 answer

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