An X-ray beam of wavelength `1.0Å` is incident on a crystal of lattice spacing 2.8 `Å`. Calculate the value of Bragg angle for first order of diffraction.

An X-ray has a wavelength of 0.010 Å. Its momentum is

Light of wavelength 5500 Å is incident on a slit of width 'a'. For what vlaue of 'a' the first minimum in the diffraction pattern falls at 30^(@) ?

The photoelectric threshold wavelength for a metal is 10,000 Å . When light of wavelength 5461 Å is incident on it, the retarding potential in Millikan's experiment is 1.02 V. Calculate the value of Planck's constant.

A slit of width a is illuminated by monochromatic light of wavelength 650 mm at normal incidence calculate the value of a when (a). The first minimum falls at an angle of diffraction of 30^(@) (b). The first maximum falls at an angle of diffraction of 30^(@) .

A slit of width d is illuminated by a monochromatic light of wavelength 700 nm at normal incidence. Calculate the value of d for position of (i) first minimum at an angle of diffraction of 30^(@) (ii) first maximum at an angle of diffraction of 30^(@) .

An electron beam of energy 10 KeV is incident on metallic foil. If the interatomic distance is 0.55Å . Find the angle of diffraction.

The first order reflection of a beam of X-rays of wavelength 1.54 Ã… from the (100) face of a crystal of the simple cubic type occurs at an angle of 11.29^(@) . Calculate the length of the unit cell.

The angle of reflection for first order monochromatic X-rays from a crystal whose atomic spacing is 2.5 Å is 15^(@) . Calculate the wavelength of X-rays.