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The surface of a metal is illuminated with the light of 400nm. The kinetic energy of the ejected photoelectrons was found to be $1.68eV$. The work function of the metal is $(hc=1240eVnm)$

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hree distinct points A, B and C are given in the 2 - ditmensional c pla nt the poi ne such that the ratio of the distance of any one of them from (1, 0) to the distance from the point (-1, 0) is equal to circumcentre of the triangle ABC is at the point 3 JEE 2009]

Relative permittivity and permeability of a material are $ϵ_{r}andμ_{r}$, respectively. Which of the following values of these quantities are allowed for a diamagnetic material ?

A parabola has the origin as its focus and the line $x=2$as the directrix. Then the vertex of the parabola is at

The two functional groups present in a typical carbohydrate are

The set representing the correct order of ionic radius is

Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of division on the circular scale is 50. Further, it is found that the screw gauge has a zero error of $−0.03$ mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale division in line with the main scale as 35. The diameter of the wire is

Let $P(r)=πR_{4}Q r$ be the charge desntiy distribution for a solid sphere of radius R and total charge Q. for a point 'p' inside the sphere at distance \displaystyle{r}_{}

If a line makes an angle of $4π $with the positive directions of each of x-axis and y-axis, then the angle that the line makes with the positive direction of the z-axis is