Demonstrating the relationship between the energy and frequency of light

Physics Teacher

Volumn 38, Issue 3, 2000, Pages 152-

  Cortel, Adolf ^a  

^a IES El Cairat   (Spain)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 85007296860     PISSN: 0031921X     EISSN: 19434928     Source Type: Journal    
DOI: 10.1119/1.880480     Document Type: Note

References (7)

1. T. R. Carver, Am. J. Phys. 43, 370-371 (1975).
2. R. E. Ellefson, Am. J. Phys. 38, 767-768 (1970).
3. This demonstration is described in the 1998 catalogue of Educational Innovations, p. 35. (151 River Road, Cos Cob, CT 06807-2514; www.teachersource.com).
4. I strongly recommend the PS-08A grating from Learning Technologies, Inc. (40 Cameron Ave., Somersville, MA 02144; www.starlab.com) because of its very bright firstorder spectrum. (~ $8 for two 5-× 5-in pieces).
5. These strips have many uses because of their persistent phosphorescence, for example to mark escape routes. The phosphorescent material is zinc sulfide or zinc-cadmium sulfide activated with copper. They are available from a variety of stores and shops, for example, Educational Innovations (see Ref. 3).
6. For instance, Roscogel #15 (deep straw). Rosco, 36 Bush Ave., Port Chester, NY 10573.
7. We use an Agfa Reflecta projector. Ordinary glass is transparent to near UV photons up to about 350 nm. However, the intensity in the near UV will depend on the temperature of the filament of the bulb. Some projectors may give more phosphorescence in the near-UV region.