Electron, Photon, Photoelectric Effect and X-Rays — Physics STD 12 Science — Question

In a cyclotron, a charged particle.

The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon P-N junctions are (a) Drift in forward bias, diffusion in reverse bias(b) Diffusion in forward bias, drift in reverse bias(c) Diffusion in both forward and reverse bias(d) Drift in both forward and reverse bias

In a single slit diffraction experiment first minimum for red light (660 nm) coincides with first maximum of some other wavelength l'. The value of l' is (a) 4400 Å(b) 6600 Å(c) 2000 Å(d) 3500 Å

Which series of hydrogen atom's spectrum does not lie in infrared region ?

In the given circuit, with steady current, the potential drop across the capacitor must be

The minimum distance between an object and its real image formed by a convex lens is(a) 1.5 f (b) 2 f (c) 2.5 f(d) 4 f

A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles, then(a) The charge on the capacitor increases(b) The voltage across the plates decreases(c) The capacitance increases(d) The electrostatic energy stored in the capacitor increases

A condenser of capacitance 10 μF has been charged to 100 volts. It is now connected to another uncharged condenser in parallel. The common potential becomes 40 volts. The capacitance of another condenser is(a) 15 μF (b) 5 μF(c) 10 μF(d) 16.6 μF