1.

Crystallography studies the analysis of

1. X ray spectra of elements and the study of crystal structure

2. X ray spectra of elements only

3. Ultraviolet spectra of sources and the study of crystal structure

4. Visible spectra of sources and the study of crystal structure

2.

Mosley's law establishes X ray frequencies of the target element with its

1. Lattice constant

2. Atomic weight

3. Atomic number

4. Density

3.

The lattice constant of a crystal is 10 ^-7 cm. The upper limit for the wavelength of X rays with this crystal is

1. 20 A.U.

2. 10 A.U.

3. 2 A.U.

4. 1 A.U.

4.

X rays are not helpful in

1. the study of crystal structure

2. the study of crystal surface

3. measurement of distances between atoms in crystals

4. the study of crystal symmetry

5.

For an incident X ray photon of energy 2 l0 ^-14 joule scattered at an angle ? = 60 the energy of the scattered photon is approximately

1. 1.8 10 ^-12 joule

2. 1.8 10 ^-15 joule

3. 1.8 10 ^-13 joule

4. 1.8 10 ^-14 joule

6.

For the same scattering processes as given in question No. 5 the scattered electron has an energy approximately

1. 2 10 ^-13 joule

2. 1 10 ^-16 joule

3. 2 10 ^-14 joule

4. 2 10 ^-12 joule

7.

Check the correct statement

1. X ray energy remains unchanged and electron energy is increased

2. X ray energy is reduced and electron energy is increased

3. X ray energy is reduced and electron energy remains the same

4. No change of energy transfer is...