Physics NCERT Exemplar Solutions Class 12th Chapter Thirteen

The elongation of a wire on the surface of the earth is 10^-4m. The same wire of same dimensions is elongated by 6 * 10^-5 m on another planet. The acceleration due to gravity on the planet will be__________ms^-2. (Take acceleration due to gravity on the surface of earth = 10 ms^-2)

The magnetic flux through a coil perpendicular to its plane is varying according to the relation $\varphi =\left(5t^3+4t^2+2t-5\right)$  Weber. If the resistance of the coil is 5 ohm, then the induced current through the coil at t = 2s will be

For the network shown below, the value of V_B – VA is_________ V.

  $\sqrt[]{d_1}and\sqrt[]{d_2}$ are the impact parameters corresponding to scattering angles 60° and 90° respectively, when an a particle is approaching a gold nucleus. For d₁ = x d₂, the value of x will be________.

The activity of a radioactive material is 2.56 * 10^-3 Ci. If the half life of the  material is 5 days, after how many days the activity will become 2 * 10^-5 Ci?

The activity of a radioactive material is 2.56 * 10^-3 Ci. If the half life of the  material is 5 days, after how many days the activity will become 2 * 10^-5 Ci?

Two lighter nuclei combine to form a comparatively heavier nucleus by the relation given below: ${}_1{}^{2}X{+}_1^{2}X=\frac{4}{2}Y$

The binding energies per nucleon for are 1.1 Me V and 7.6

Me V respectively. The energy released in this process is________ Me V.

In the hydrogen spectrum, $\lambda$ be the wavelength of first transition line of Lyman series. The wavelength difference will be $"a\lambda "$ between the wavelength of 3rd transition line of Paschen series and that 2nd transition line B Balmer series where a = __________.

Mass numbers of two nuclei are in the ratio of 4 : 3. Their nuclear densities will be in the ratio of

A nucleus of mass M at rest splits into two parts having masses $\frac{M\text{'}}{3}$ and $\frac{2M\text{'}}{2}\left(M\text{'}<M\right),$ The ratio of de Broglie wavelength of two parts will be: