Electronics — Physics STD 12 Science — Question

The shortest wavelength in the Lyman series of hydrogen spectrum is 912 Å corresponding to a photon energy of 13.6 eV. The shortest wavelength in the Balmer series is about(a) 3648 Å(b) 8208 Å(c) 1228 Å(d) 6566 Å

If the Q value of an endothermic reaction is 11.32MeV, then the minimum energy of the reactant nuclei to carry out the reaction is (in laboratory frame of reference)

Two parallel circular coils of equal radii having equal number of turns placed coaxially and separated by a distance equal to the radii of the coils carrying equal currents in same direction are known as:

A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is(a) 20%(b)  40%(c) 70%(d)  90%

If particles are moving with same velocity, then maximum de-Broglie wavelength will be for

The angular momentum of an electron in an orbit is quantized because it is a necessary condition for the compatibility with:

A particle moves in a circular path with a continuously increasing speed. Its motion is:

1. Periodic.
2. Oscillatory.
3. Simple harmonic.
4. None of them.