Physics

If a wave gets refracted into a denser medium, then which of the following is true?

If a wave gets refracted into a denser medium, then which of the following is true?

A convex lens has power P. It is cut into two halves along its principal axis. Further one piece (out of the two halves) is cut into two halves perpendicular to the principal axis (as shown in figures). Choose the incorrect option for the reported pieces.

Given below are two statements:

Statement I : A time varying electric field is a source of changing magnetic field and vice-versa. Thus a disturbance in electric or magnetic field creates EM waves.

Statement II : In a material medium, the EM wave travels with speed v = $\frac{1}{\sqrt[]{{\mu }_0{\in }_0}}.$  In the light of the above statements, choose the correct answer for the options given below

For a uniform rectangular sheet shown in the figure, the ratio of moments of inertia about the axes perpendicular to the sheet and passing through $O$ (the centre of mass) and ${\mathrm{O}}^{\mathrm{\text{'}}}$  (corner point) is:

A quantity $X$ is given by $\left({\mathrm{I}\mathrm{F}\mathrm{v}}^2\mathrm{M}\mathrm{L}{\mathrm{L}}^4\right)$ in terms of moment of inertia $\mathrm{I}$ , force $\mathrm{F}$ , velocity $\mathrm{v}$ , work $W$ and Length $L$ . The dimensional formula for $x$  is same as that of:

Find the binding energy per neucleon for ${}_{50}^{120}\mathrm{S}\mathrm{n}$ . Mass of proton ${\mathrm{m}}_{\mathrm{p}}=\left(\mathrm{A}\right)1.00783\mathrm{U}$ , mass of neutron ${\mathrm{m}}_{\mathrm{n}}=\left(\mathrm{A}\right)1.00867\mathrm{U}$ and mass of tin nucleus ${\mathrm{m}}_{\mathrm{S}\mathrm{n}}=119.902199\mathrm{U}$ . (take $1\mathrm{U}=931\mathrm{M}\mathrm{e}\mathrm{V}$  )

A circular coil has moment of inertia $0.8\mathrm{k}\mathrm{g}{\mathrm{m}}^2$ around any diameter and is carrying current to produce a magnetic moment of $20{\mathrm{A}\mathrm{m}}^2$ . The coil is kept initially in a vertical position and it can rotate freely around a horizontal diameter. When a uniform magnetic field of $4\mathrm{T}$ is applied along the vertical, it starts rotating around its horizontal diameter. The angular speed the coil acquires after rotating by ${60}^{?}$  will be:

Consider two uniform discs of the same thickness and different radii $R_1=R$ and $R_2=\alpha R$ made of the same material. If the ratio of their moments of inertia $I_1$ and $I_2$ , respectively, about their axes is $I_1:I_2=1:16$ then the value of $\alpha$ is:

In photoelectric effect experiment, the graph of stopping potential $\vee$ versus reciprocal of wavelength obtained is shown in the figure. As the intensity of incident radiation is increased: