30.1

30.2

30.3

30.4

30.5

30.6

Setup For Absorption Spectrum

Spectroscope(setup for Emission Spectrum)

30.7

30.8

30.9

30.10

30.11

HeNe

eHe

eNe

30.12

-- Questions --

MULTIPLE CHOICE.

Choose the one alternative that best completes the statement or

answers the question.

30.13

1) The white light emitted by a fluorescent lamp is provided by the A) phosphors on the inner surface of the lamp. B) high temperature of the glowing gas. C) mercury vapor in the lamp. D) filtering effect of the glass tubing.

2) Light from a laser is A) monochromatic. B) coherent. C) in phase. D) all of these. E) none of these.

30.14

3) An atom that absorbs a photon of a certain energy can then emit A) only a photon of the same or lower energy. B) a photon of any energy. C) only a photon of that energy. D) only a photon of the same or higher energy.

4) Green light emitted by excited mercury vapor corresponds to a particular energy transition in the mercury atom. A more energetic transition might emit A) white light. B) either red or blue light. C) blue light. D) red light.

30.15

5) A traveling pulse of electromagnetic radiation is called a A) proton. B) lightron. C) photon. D) notron. E) sparktron.

6) The greater proportion of energy immediately converted to heat rather than light occurs in A) an incandescent lamp. B) a fluorescent lamp. C) both the same.

30.16

7) Atoms of neon in a glass tube can be excited A) over and over again. B) once per atom.

8) Materials can be heated until "red hot". If some material is heated until it is "green hot", then A) energy conservation would be violated. B) it would be hotter than "white hot". C) its molecules would be vibrating at nearly identical rates. D) it would liquify immediately. E) it would be a strong absorber of red light .

30.17

9) Light from a phosphorescent source A) normally has a shorter wavelength than the light that initially produced it. B) is cooler than light from a fluorescent source. C) takes longer to travel from the source to you. D) all of these. E) none of these.

10) If light in a spectroscope were passed through a star-shaped opening instead of a thin slit, spectral lines would appear as

A) stars. B) blobs of no definite shape. C) lines, but with poorer resolution.

30.18

11) Which light source is more energy-efficient? A) an incandescent lamp B) a fluorescent lamp C) both about the same

12) The highest frequency light of those below is A) blue. B) red. C) violet. D) green. E) all the same.

30.19

13) The main visible difference between phosphorescent and fluorescent materials is A) an afterglow. B) the greenish color of phosphorescence. C) a difference in brightness.

14) Fluorescent minerals on display in museums are illuminated with A) infrared light. B) ultraviolet light. C) often either or both. D) none of these.

30.20

15) In the process of fluorescence, the input is high-frequency light and the output is

A) equally high-frequency light. B) lower-frequency light. C) higher-frequency light.

16) Which of the following continually emits electromagnetic radiation? A) radio antennas B) insects C) red-hot coals D) all of these E) none of these

30.21

-- Answers --

MULTIPLE CHOICE.

The one alternative that best completes the statement or

answers the question.

30.22

Chapter 30

1) Answer: A 2) Answer: D 3) Answer: A 4) Answer: C 5) Answer: C 6) Answer: A 7) Answer: A 8) Answer: C 9) Answer: E 10) Answer: A 11) Answer: B 12) Answer: C 13) Answer: A 14) Answer: B 15) Answer: B 16) Answer: D