List of top Physics Questions on Modern Physics asked in MET

A laser device produces amplification in the

Surface of the lake is at 2°C and depth of the lake is 20 m. Find the temperature of the bottom of the lake

\(y_1 = 4\sin(\Omega t + kx)\), \(y_2 = -4\cos(\Omega t + kx)\). The phase difference is

The photoelectric cut-off voltage in an experiment was found to be 1.5 V. The work function for the material used in the experiment was 4.2 eV. The maximum kinetic energy of the photoelectrons emitted was

The ratio of the wavelength of first line of Balmer series to the first line of Lyman series is

An electron at rest is accelerated through a potential difference of 200 V. If the electron acquires a velocity of \(8.4 \times 10^8\) cm/s, its \(e/m\) ratio is

The half-life period of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr is

If levels 1 and 2 are separated by an energy \(E_2 - E_1\), such that the corresponding transition frequency falls in the middle of the visible range, calculate the ratio of the populations of two levels in thermal equilibrium at room temperature.

In the Boolean Algebra \(\overline{A \cdot B}\) is same as

Due to a force of \((6\hat{i} + 2\hat{j})\ \text{N\) the displacement of a body is \((3\hat{i} - \hat{j})\ \text{m}\), then the work done is}

An electron is accelerated through a potential difference of 200 V. If \( e/m \) for the electron is \( 1.6 \times 10^{11} \, \text{C/kg} \), the velocity acquired by the electron will be:

The rest energy of an electron is 0.511 MeV. The electron is accelerated from rest to a velocity of 0.5c. The change in its energy will be:

Cooking is fast in a pressure cooker, because

The unit of Planck's constant is: