4. 24) Which statement about x rays is correct? (Points : 5) O A) Their waveleng

Question

4. 24) Which statement about x rays is correct? (Points : 5) O A) Their wavelengths are greater than those of visible light. O B) They are emitted when electrons in complex atoms (those having large atomic numbers) make transitions from the K shell to higher shells. O C) They are emitted when electrons in complex atoms (those having large atomic numbers) make transitions from higher shells to the K shell. O D) They are emitted when electrons in hydrogen make transitions from higher shells to the K shell. O E) The energy of x-ray photons is greater than the energy of gamma ray photons. 5. 25) Which statement about semiconductors is correct? (Points: 5) O A) Their resistivity is normally somewhat greater than that of most insultors. O B) A hole in a semiconductor is due to the removal of a proton. O C) Electrical conduction in an n-type semiconductor is mostly due to the transfer of neutrons. O D) Electrical conduction in an p-type semiconductor is mostly due to the transfer of protons. O E) Electrical conduction in a p-type semiconductor is mostly due to the transfer of holes.

Explanation / Answer

24)option c

these are transitions from upper shells into K shell (called K lines), into L shell (called L lines) and so on.

25) option e

The modern understanding of the properties of a semiconductor relies on quantum physics to explain the movement of electrons and holes (collectively known as "charge carriers") in acrystal lattice.[2] Doping greatly increases the number of charge carriers within the crystal. When a doped semiconductor contains mostly free holes it is called "p-type", and when it contains mostly free electrons it is known as "n-type". The semiconductor materials used in electronic devices are doped under precise conditions to control the concentration and regions of p- and n-type dopants

28) option c

angle = wavelength / distance

29) option c spin quantum no is -1/2 or +1/2

30) option d

ionic (complete transfer of electron) and covalent (sharing of electrons) bonding. He added to his covalent bonding theory that atoms can have a double or triple bonds with other atoms when electrons are shared.

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