answer (total of 8.0 marks, 0.5 marks each). All of the following are true for h

Question

answer (total of 8.0 marks, 0.5 marks each). All of the following are true for hollow-cathode tubes, except a) hollow-cathode tubes emit broad emission lines. b) the cathode of a hollow-cathode tube is made of the same element whose emission lines we want. the low pressure Ne or Ar gas is ionized when voltage is applied, which ionizes the gas and accelerates the ions toward the cathode. c) d) e) the kinetic energy of the ionized gas is sufficiently high to sputter (eject) metal atoms from the cathode. the gaseous metal atoms are excited by collisions with high-energy electrons and emit photons with characteristic wavelengths that are absorbed by the analyte.

Explanation / Answer

Hollow-cathode tubes emit narrow emission lines. Therefore all of the statements are true except the first statement (a)

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