TODAY IN SCIENCE HISTORY ®  •  TODAYINSCI ®
Celebrating 24 Years on the Web
Find science on or your birthday

Today in Science History - Quickie Quiz
Who said: “A change in motion is proportional to the motive force impressed and takes place along the straight line in which that force is impressed.”
more quiz questions >>
Home > Category Index for Science Quotations > Category Index P > Category: Phosphorescent

Phosphorescent Quotes (3 quotes)

[Concerning] phosphorescent bodies, and in particular to uranium salts whose phosphorescence has a very brief duration. With the double sulfate of uranium and potassium ... I was able to perform the following experiment: One wraps a Lumière photographic plate with a bromide emulsion in two sheets of very thick black paper, such that the plate does not become clouded upon being exposed to the sun for a day. One places on the sheet of paper, on the outside, a slab of the phosphorescent substance, and one exposes the whole to the sun for several hours. When one then develops the photographic plate, one recognizes that the silhouette of the phosphorescent substance appears in black on the negative. If one places between the phosphorescent substance and the paper a piece of money or a metal screen pierced with a cut-out design, one sees the image of these objects appear on the negative. One can repeat the same experiments placing a thin pane of glass between the phosphorescent substance and the paper, which excludes the possibility of chemical action due to vapors which might emanate from the substance when heated by the sun's rays. One must conclude from these experiments that the phosphorescent substance in question emits rays which pass through the opaque paper and reduces silver salts.
[Although the sun is irrelevant, and he misinterprets the role of phosphorescence, he has discovered the effect of radioactivity.]
Read at French Academy of Science (24 Feb 1896). In Comptes Rendus (1896), 122, 420. As translated by Carmen Giunta on the Classic Chemistry web site.
Science quotes on:  |  Action (342)  |  Become (821)  |  Being (1276)  |  Brief (37)  |  Chemical (303)  |  Cloud (111)  |  Conclude (66)  |  Cut (116)  |  Design (203)  |  Develop (278)  |  Discover (571)  |  Discovery (837)  |  Due (143)  |  Effect (414)  |  Emit (15)  |  Experiment (736)  |  Expose (28)  |  Exposed (33)  |  Glass (94)  |  Heat (180)  |  Hour (192)  |  Image (97)  |  Metal (88)  |  Money (178)  |  Must (1525)  |  Negative (66)  |  Object (438)  |  Opaque (7)  |  Outside (141)  |  Paper (192)  |  Pass (241)  |  Perform (123)  |  Phosphorescence (2)  |  Photograph (23)  |  Possibility (172)  |  Potassium (12)  |  Question (649)  |  Radioactivity (33)  |  Ray (115)  |  Recognize (136)  |  Reduce (100)  |  Role (86)  |  Salt (48)  |  See (1094)  |  Silhouette (4)  |  Silver (49)  |  Substance (253)  |  Sun (407)  |  Through (846)  |  Two (936)  |  Uranium (21)  |  Vapor (12)  |  Whole (756)

Question: If you walk on a dry path between two walls a few feet apart, you hear a musical note or “ring” at each footstep. Whence comes this?
Answer: This is similar to phosphorescent paint. Once any sound gets between two parallel reflectors or walls, it bounds from one to the other and never stops for a long time. Hence it is persistent, and when you walk between the walls you hear the sounds made by those who walked there before you. By following a muffin man down the passage within a short time you can hear most distinctly a musical note, or, as it is more properly termed in the question, a “ring” at every (other) step.
Genuine student answer* to an Acoustics, Light and Heat paper (1880), Science and Art Department, South Kensington, London, collected by Prof. Oliver Lodge. Quoted in Henry B. Wheatley, Literary Blunders (1893), 175-6, Question 2. (*From a collection in which Answers are not given verbatim et literatim, and some instances may combine several students' blunders.)
Science quotes on:  |  Answer (389)  |  Before (8)  |  Bound (120)  |  Distinct (98)  |  Down (455)  |  Dry (65)  |  Examination (102)  |  Following (16)  |  Footstep (5)  |  Hear (144)  |  Howler (15)  |  Long (778)  |  Man (2252)  |  More (2558)  |  Most (1728)  |  Music (133)  |  Never (1089)  |  Note (39)  |  Other (2233)  |  Paint (22)  |  Parallel (46)  |  Passage (52)  |  Path (159)  |  Persistence (25)  |  Persistent (18)  |  Question (649)  |  Reflector (4)  |  Short (200)  |  Similarity (32)  |  Sound (187)  |  Step (234)  |  Stop (89)  |  Term (357)  |  Time (1911)  |  Two (936)  |  Walk (138)  |  Wall (71)

Firefly meteorites blazed against a dark background, and sometimes the lightning was frighteningly brilliant. Like a boy, I gazed open-mouthed at the fireworks, and suddenly, before my eyes, something magical occurred. A greenish radiance poured from Earth directly up to the station, a radiance resembling gigantic phosphorescent organ pipes, whose ends were glowing crimson, and overlapped by waves of swirling green mist.
“Consider yourself very lucky, Vladimir,” I said to myself, “to have watched the northern lights.”
…...
Science quotes on:  |  Against (332)  |  Background (44)  |  Blaze (14)  |  Boy (100)  |  Brilliant (57)  |  Consider (428)  |  Crimson (4)  |  Dark (145)  |  Directly (25)  |  Earth (1076)  |  End (603)  |  Eye (440)  |  Firefly (8)  |  Firework (2)  |  Gaze (23)  |  Gigantic (40)  |  Glow (15)  |  Green (65)  |  Light (635)  |  Lightning (49)  |  Lucky (13)  |  Magic (92)  |  Meteorite (9)  |  Mist (17)  |  Mouth (54)  |  Myself (211)  |  Northern Lights (2)  |  Occur (151)  |  Open (277)  |  Organ (118)  |  Overlap (9)  |  Pipe (7)  |  Pour (9)  |  Radiance (7)  |  Resemble (65)  |  Say (989)  |  Something (718)  |  Sometimes (46)  |  Station (30)  |  Suddenly (91)  |  Swirl (10)  |  Watch (118)  |  Wave (112)


Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
Quotations by:Albert EinsteinIsaac NewtonLord KelvinCharles DarwinSrinivasa RamanujanCarl SaganFlorence NightingaleThomas EdisonAristotleMarie CurieBenjamin FranklinWinston ChurchillGalileo GalileiSigmund FreudRobert BunsenLouis PasteurTheodore RooseveltAbraham LincolnRonald ReaganLeonardo DaVinciMichio KakuKarl PopperJohann GoetheRobert OppenheimerCharles Kettering  ... (more people)

Quotations about:Atomic  BombBiologyChemistryDeforestationEngineeringAnatomyAstronomyBacteriaBiochemistryBotanyConservationDinosaurEnvironmentFractalGeneticsGeologyHistory of ScienceInventionJupiterKnowledgeLoveMathematicsMeasurementMedicineNatural ResourceOrganic ChemistryPhysicsPhysicianQuantum TheoryResearchScience and ArtTeacherTechnologyUniverseVolcanoVirusWind PowerWomen ScientistsX-RaysYouthZoology  ... (more topics)
Sitewide search within all Today In Science History pages:
Visit our Science and Scientist Quotations index for more Science Quotes from archaeologists, biologists, chemists, geologists, inventors and inventions, mathematicians, physicists, pioneers in medicine, science events and technology.

Names index: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Categories index: | 1 | 2 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Thank you for sharing.
- 100 -
Sophie Germain
Gertrude Elion
Ernest Rutherford
James Chadwick
Marcel Proust
William Harvey
Johann Goethe
John Keynes
Carl Gauss
Paul Feyerabend
- 90 -
Antoine Lavoisier
Lise Meitner
Charles Babbage
Ibn Khaldun
Euclid
Ralph Emerson
Robert Bunsen
Frederick Banting
Andre Ampere
Winston Churchill
- 80 -
John Locke
Bronislaw Malinowski
Bible
Thomas Huxley
Alessandro Volta
Erwin Schrodinger
Wilhelm Roentgen
Louis Pasteur
Bertrand Russell
Jean Lamarck
- 70 -
Samuel Morse
John Wheeler
Nicolaus Copernicus
Robert Fulton
Pierre Laplace
Humphry Davy
Thomas Edison
Lord Kelvin
Theodore Roosevelt
Carolus Linnaeus
- 60 -
Francis Galton
Linus Pauling
Immanuel Kant
Martin Fischer
Robert Boyle
Karl Popper
Paul Dirac
Avicenna
James Watson
William Shakespeare
- 50 -
Stephen Hawking
Niels Bohr
Nikola Tesla
Rachel Carson
Max Planck
Henry Adams
Richard Dawkins
Werner Heisenberg
Alfred Wegener
John Dalton
- 40 -
Pierre Fermat
Edward Wilson
Johannes Kepler
Gustave Eiffel
Giordano Bruno
JJ Thomson
Thomas Kuhn
Leonardo DaVinci
Archimedes
David Hume
- 30 -
Andreas Vesalius
Rudolf Virchow
Richard Feynman
James Hutton
Alexander Fleming
Emile Durkheim
Benjamin Franklin
Robert Oppenheimer
Robert Hooke
Charles Kettering
- 20 -
Carl Sagan
James Maxwell
Marie Curie
Rene Descartes
Francis Crick
Hippocrates
Michael Faraday
Srinivasa Ramanujan
Francis Bacon
Galileo Galilei
- 10 -
Aristotle
John Watson
Rosalind Franklin
Michio Kaku
Isaac Asimov
Charles Darwin
Sigmund Freud
Albert Einstein
Florence Nightingale
Isaac Newton


by Ian Ellis
who invites your feedback
Thank you for sharing.
Today in Science History
Sign up for Newsletter
with quiz, quotes and more.