The roots of the equation $x^3-14x^2+56x-64=0$ are in

$A$ particle moving with a uniform acceleration travels $24 \,m$ and $64 \,m$ in the first two consecutive intervals of $4 \,sec$ each. Its initial velocity is............$m/sec$.

The experimentally determined molar mass of a non-volatile solute,$BaCl_2$,in water by Cottrell's method,is

If $\alpha+\beta=-2$ and $\alpha^3+\beta^3=-56$,then the quadratic equation whose roots are $\alpha$ and $\beta$ is

Among the following series of transition metal ions,the one where all metal ions have $3d^2$ electronic configuration is

$A$ $200\, W$ sodium street lamp emits yellow light of wavelength $0.6\, \mu m$. Assuming it to be $50\%$ efficient in converting electrical energy to light,the number of photons of yellow light it emits per second is: