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	<general><structure><source>LOM v1.0</source><value>collection</value></structure><aggregationlevel><source>LOM v1.0</source><value>2</value></aggregationlevel><identifier><catalog>URL</catalog><entry>http://portal.discoverthecosmos.eu/node/159727</entry></identifier><title><langstring xml:lang="en">Measuring the constant of Planck</langstring></title><language>en</language><description><langstring xml:lang="en">Proposed practical is suitable for students aged 18 - 19 years. They will determine Planck’s constant using the photoelectric effect. For each frequency, adjust the potential divider until the stopping potential has been reached. Draw the graph of stopping potential versus frequency and determine Planck’s constant using tangent of angle or angular quotient.</langstring></description><keyword><langstring xml:lang="en">light</langstring><langstring xml:lang="en">optics</langstring><langstring xml:lang="en">waves</langstring><langstring xml:lang="en">properties of light</langstring></keyword></general><lifecycle><status><source>LOM v1.0</source><value>final</value></status><version><langstring xml:lang="en">1.0</langstring></version><contribute><role><source>LOM v1.0</source><value>author</value></role><date><datetime>2009-04-10</datetime><description/></date><centity><vcard>Aneta Marinova</vcard></centity></contribute><contribute><role><source>LOM v1.0</source><value>publisher</value></role><date><datetime>2009-06-10</datetime><description/></date><centity><vcard>Shumen University</vcard></centity></contribute></lifecycle><metametadata><language>en</language><metadatascheme>LOM v1.0</metadatascheme><contribute><role><source>LOM v1.0</source><value>creator</value></role><date><datetime>2009-06-10</datetime><description/></date><centity><vcard>Borislav Borisov</vcard></centity></contribute><contribute><role><source>LOM v1.0</source><value>validator</value></role><date><datetime>2009-06-10</datetime><description/></date><centity><vcard>Borislav Borisov</vcard></centity></contribute></metametadata><technical><duration><datetime/><description/></duration><requirement><type><source>LOM v1.0</source><value/></type><name><source>LOM v1.0</source><value/></name><minimumversion/><maximumversion/></requirement><installationremarks/><otherplatformrequirements/><size></size><format>text/html</format><location>http://portal.discoverthecosmos.eu/node/159727</location></technical><rights><cost><source>LOM v1.0</source><value>no</value></cost><copyrightandotherrestrictions><source>LOM v1.0</source><value>no</value></copyrightandotherrestrictions><description/></rights><educational><interactivitytype><source>LOM v1.0</source><value>active</value></interactivitytype><interactivitylevel><source/><value>high</value></interactivitylevel><semanticdensity><source/><value/></semanticdensity><difficulty><source>LOM v1.0</source><value>medium</value></difficulty><typicallearningtime><datetime>2 didactic hours</datetime><description/></typicallearningtime><learningresourcetype><source>LOM v1.0</source><value>Guided Research</value></learningresourcetype><intendedenduserrole><source>LOM v1.0</source><value>teacher</value></intendedenduserrole><context><source>LOM v1.0</source><value>school education</value></context><typicalagerange><langstring xml:lang="en">18-25</langstring></typicalagerange></educational><classification><purpose><source>LOM v1.0</source><value>Discipline</value></purpose><taxonpath><source><langstring xml:lang="en">Science</langstring></source><taxon><id/><entry><langstring xml:lang="en">Light: Properties of light - generally</langstring></entry></taxon></taxonpath><description/></classification></lom>
