Moving Charges and Magnetism — Physics STD 12 Science — Question

The wave-like character was experimentally proved for light by:

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal Vs the frequency of the incident radiation gives as straight the whose slope?

The lines of forces due to earth's horizontal component of magnetic field are(a) Parallel straight lines(b) Concentric circles(c) Elliptical(d) Parabolic

Characteristic X-rays are produced due to (a) Transfer of momentum in collision of electrons with target atoms(b) Transition of electrons from higher to lower electronic orbits in an atom(c) Heating of the target(d) Transfer of energy in collision of electrons with atoms in the target

In the interference pattern, energy is (a) Created at the position of maxima(b) Destroyed at the position of minima(c) Conserved but is redistributed(d) None of the above

In the Bohr model of the hydrogen atom, let R, v and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively. Which of the following quantity is proportional to the quantum number n(a) R/E(b) E/v(c) RE(d) vR

A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it:

When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is(a) Amplitude modulation(b) Phase modulation(c) Frequency modulation(d) All of the above