Energy of the photon of sodium light of wavelength `5,890 overset @A` equals the energy gap between valence and conduction band of a semiconductor.
Find the minimum energy E required to create a hole-electron pair.

Fill ups If there is a large energy gap between the filled valence band and empty conduction band, the subtance acts as …………….. .

Light of wavelength 5000 overset @A falls on a photosensitive plate with work function 1.9 eV. Find energy of photon in eV(electron Volt)

Fill ups The ……………., a property of materials C, Si and Ge, depends upon the energy gap between their conduction and valence bonds.

Light of wavelength 5000 overset @A falls on a photosensitive plate with work function 1.9 eV. FInd maximum kinetic energy of photoelectron and stopping potential.

In a hydrogen atom, the electron and proton are bound at a distance of about 0.53 A: (a) Estimate the potential energy of the system in eV, if the zero of potential energy is taken at 1.06 overset @A separation of the electron from proton? (b) What is the minimum work required to free the electron, given that its kinetic energy in the orbit is half the magnitude of potential energy obtained in (a)?

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: The energy gap between the valence band and conduction band is greater in silicon than germanium. Reason: Thermal energy produces fewer minority carries in silicon than in germanium.

The energy gaps in the energy band diagrams of a conductor, semiconductor and insulator are E_1 , E_2 , and E_3 . Arrange them in increasing order.

An electron and a photon each have a wavelength of 1.00 nm. Find the energy of the photon?

An electron and a photon each have a wavelength of 1.00 nm. Find the kinetic energy of electron.