Dual Nature of Radiation and Matter Test - 2

A hydrogen atom and a Li++ ion are both in the second excited state. If are their respective electronic angular momenta, and EH and ELi their respective energies, then:

Directions: The following question has four choices out of which ONLY ONE is correct. In photo electric effect, the K.E. of electrons emitted from the metal surface depends upon

Which one of the following will deflect in electric field

A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is:

Monochromatic light of wavelength 3000 border=0 is incident on a surface area 4 cm2. If intensity of light is 150 mW/m2, then rate at which photons strike the target is

Monochromatic light of frequency 6.0 x 1014 Hz is produced by a laser. The power emitted is 2 x 10-3 W. The number of photons emitted on the average by the source per second is

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate, light source is put on and a saturation photoelectric current is recorded . An electric field is switched on which has a vertically downward direction ,

The electron in a hydrogen atom make a transition from an excited state to the ground state. Which of the following statements is true?

The de - Broglie wavelegth of an electron in the first Bohr orbit is

 Directions: The following question has four choices, out of which, ONLY ONE is correct. Threshold wavelength for photoelectric emission, from a metal surface, is 5200 . Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from