11.Can two sodium vapour lamps.act as coherent sources? Explain in brief.
743 Views
12.Why all over the world, giant telescopes are of reflecting type? State any one reason.
261 Views
13.A ray of ordinary light is incident on a rectangular block of glass at Brewster’s angle. What is the angle between the reflected ray and the refracted ray of light?
176 Views
14.Find the momentum of a photon of energy 3.0 eV.
15.The half life of a certain radio active element is 8 hours. If a pupil starts with 32 g of this element, how much of the sample will be left behind at the end of one day?
Half life period is 8 hours
N0 = 32 gm
After 8 hours it will remain 1/2 of No
After 16 hours, it will remain 1/4 of No
After 24 hours it will remain 1/8 of No
So, 32/8 = 4 gm of element will be remain after one day.
214 Views
Advertisement
16.If a hydrogen atom goes from III excited state to II excited state, what kind of radiation (visible light, ultra violet, infra red, etc.) is emitted?
292 Views
17.Where in our universe is the thermo-nuclear energy being released naturally?
340 Views
18.In which of the solids (semi-conductors, conductors or insulators) do conduction band and valence band overlap?
226 Views
Advertisement
19.What is the symbol of a NOR gate?
241 Views
20.Find the electric charge Q1 on plates of capacitor C1, shown in Figure 3 below:
Short Answer Type
Switch
