Electric Charges and Fields — Physics STD 12 Science — Question

The radioactive material does not emit :

Two waves of same amplitude and same wavelength are superimposed in different phases. The amplitude of the resultant wave will be maximum when the phase difference between them is:

A piece of semiconductor is connected in series in an electric circuit. On increasing the temperature, the current in the circuit will(a) Decrease(b) Remain unchanged(c) Increase(d) Stop flowing

Wave front formed by the collimator of a spectrometer:

A capacitor with air as the dielectric is charged to a potential of  100 volts. If the space between the plates is now filled with a dielectric of dielectric constant 10, the potential difference between the plates will be(a) 1000  volts (b) 100 volts (c) 10 volts(d) Zero

Assertion :  The energy of charged particle moving in a uniform magnetic field does not change.
Reason    : Work done by magnetic field on the charge is zero.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

In Davison-Germer experiment, an electron beam is incident on a crystal. The reflected beam consists of: