A neutron beam of energy E scatters from atoms on a surface with a spacing d = 0.1 nm.The first maximum of intensity in the refelcted beam occurs at `theta = 30^@`.What is the kinetic energy E of the beam in eV?

The work function of caesium metal is 2.14 eV. When light of frequency 6 xx 10^14 Hz is incident on the metal surface, photoemission of electrons occurs.What is the maximum kinetic energy of the emitted electrons ?

A parallel beam of green light of wavelength 546 nm passes through a slit of width 0.4 mm. The intensity pattern of the transmitted light is seen on a screen which is 40 cm away. What is the distance between the two first order of minima?

A sphere of mass 0.5 kg and diameter 1 m rolls without sliding with a constant velocity of 5 m//s . What is the ratio of the rotational K.E. to the total kinetic energy of thesphere ?

Two beams, one of red light and other of blue light, of the same intensity are incident on a metallic surface to emit photoelectrons. Which one of the two beams emits electrons of greater kinetic energy?

The photoelectric threshold wavelength of a metal is 230 nm. Determine the maximum kinetic energy in joule and eV of the ejected electron from metal surface when it is exposed to a radiation of wavelength 180 nm. (Planck's constant h = 6.63 xx 10^-34 J-S, C = 3 xx 10^8 m//sec .)

Radiation of wavelength 120 nm ejects photoelectrons from a plate whose work function is 3.0 eV. If a magnetic field of flux density 4.0 xx10^-5 T is applied parallel to the plate, then the radius of the path followed by electrons ejected normally from the plate with maximum energy will be

A beam of light consisting of two wavelengths, 650 nm arid 520 nm is used to obtain interference fringes in a Young's double-slit experiment. If distance between slit and screen is 1.2 m and distance between two-slitsis 3 mm. What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?

In a cyclotron protons are to be accelerated. Radius of the D is 60 cm and its oscillator frequency is 10 Mhz. What will be the kinetic energy of the accelerated proton? Proton mass = 1.67 xx 10^-27 kg , e = 1.6 xx 10^-19C lev = 1.6 xx 10^-19 J