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If a source of power 4 kW produces $10_{20}$ photons/second, the radiation belong to a part of the specturm called

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Which of the following pairs represents linkage isomers ?

Consider a rubber ball freely falling from a height h = 4.9 m onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time the height as function of time will be

On the basis of the following thermochemical data : $(ΔfG_{2}H_{(aq)}=0)$ $H_{2}O(l)→H_{+}(aq)+OH_{−}(aq),ΔH=57.32kJ$ \displaystyle{H}_{{{2}}}{\left({g}\right)}+

Let a, b, c be any real numbers. Suppose that there are real numbers x, y, z not all zero such that $x=cy+bz,y=az+cxandz=bx+ay$. Then $a_{2}+b_{2}+c_{2}+2abc$is equal to

The sum of the series $2!1 −3!1 +4!1 −…$ upto infinity is

The transition from the state $n=4ton=3$ in a hydrogen like atom results in ultraviolet radiation Infrared radiation will be obtained in the transition from

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)

The differential equation of all circles passing through the origin and having their centres on the x-axis is