Physics Test 28...

An electron moves in a magnetic field of 6 × 10⁻⁴ T with speed 3 × 10⁷ m/s perpendicular to the field. What is its radius of motion? (take mass of electron = 9 × 10⁻³¹ kg, charge = 1.6 × 10⁻¹⁹ C)

The process where a heavy nucleus splits into two or more lighter nuclei is called nuclear fission. This process releases energy primarily because the fission fragments have:

In accordance with the Bohr's model, find the quantum number that characterises the earth's revolution around the sun in an orbit of radius 1.5 × 10¹¹ m with orbital speed  3 × 10⁴ m/s. (Mass of earth  = 6.0 × 10²⁴ kg. .)

A plane glass plate is placed over various coloured letters (violet, green, yellow, red). The letter which appears to raise more is

In the photoelectric effect, for electrons to be ejected from a metal surface, the incident light must have a certain minimum value of which of the following properties?

The escape velocity of a sphere of mass m is given by ( G= universal gravitational constant, M_e = mass of earth and R_e= radius of earth):

The work function of a metal surface is 2.0 eV . If light of wavelength 310 nm is incident on the surface, what is the maximum kinetic energy of the emitted photoelectrons? (Use hc = 1240eV ⋅ nm )