Question

Question 9 (5 points) Hollow cathode lamps a) have an anode made of the element(s) the lamp is intended to analyze for. b) have a cathode made of the element(s) the lamp is intended to analyze for. c) are filled with either Neon or Argon gas. are always made with a mercury cathode. d) e) a and b f) a and c g) a and d h) b and c i) b and d

Answer 1

Hollow cathode lamp:

Hollow cathode lamp is used as a light source in AAS (atomic absorption spectroscopy). Hollow cathode lamp has a cathode made of the element the lamp is intended to analyse for. The anode is made by tungsten or nickel. The hollow cathode lamp filled by Nobel gases ( neon, argon, etc).

Atomic absorption spectroscopy needed a very narrow line of the radiation source to avoid signal to noise would be low. Hollow cathode lamp produces very narrow line radiation so which is used in Atomic absorption spectroscopy. In practice, atomic line width (line source) is smaller than monochromator bandwidths

Question 9 Ans:

In the given option a) to d) the statement b and c true about Hollow cathode lamp.

Correct answer: option h) b and c

Question 21 Ans:

Hollow cathode lamps are needed atomic absorption spectroscopy because of atomic bandwidths are less than monochromatos bandwidths.

  Correct answer: option c) less than