Quantum Mechanics Answers

What is the stopping potential when the metal with work function 0.6ev is illuminated with the light of 2ev ? (1) 2.6ev. (2) 3.6 ev. (3) 0.8 ev (4) 1.4ev

A beam of white light incident normally on a plane surface absorbing 70% of the light and reflecting the rest . if the incident beam carries 10W of power , find the force exerted by it on the surface . (1) 4.3× 10-5 N. (2) 4.3 × 10-6N. (3) 4.3 × 10-7N. (4) 4.3×10-8N

A cylinder containing some gas A is fitted with an idealized piston. Gas A is at 1.2 atm, 10.0 L and at 432K. What external pressure is required to compress this gas irreversibly to a final volume of 3.20L?
0.12 atm
0.33 atm
0.45 atm
0.52 atm

Determine the commutator Lz Ly.

Use stefan’s law to calculate the total power radiated per square meter by a filament at 1727^0 C having an absorption factor of 0.4.

A very small hole in an electric furnace used for treating metals acts nearly as a blackbody. If the hole has an area 100 m^2 and it is desired to maintain the metal at 1100^0 C, how much power travels through the hole?

An incandescent lamp filament has an area 50 mm^2 and operates at a temperature of 2127^0 C. Assure that all the energy furnished to the bulb is radiated from it. If the filament acts like a blackbody. How much power must be furnished to the bulb when operating.

What is gibbs paradox?why it does arises?

with the help of uncertainity principle show that electrons are not present in the atomic nucleus

Explain potential well & potential barrier?