{"id":162257,"date":"2015-12-22T03:00:00","date_gmt":"2015-12-22T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=9e109359f6c4c07b85e6681b389fad48"},"modified":"2015-12-22T03:00:00","modified_gmt":"2015-12-22T00:00:00","slug":"measurement-of-the-electron-charge-by-a-vacuum-diode","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=162257","title":{"rendered":"Measurement of the electron charge by a vacuum diode"},"content":{"rendered":"<p>The measurement of the electron charge is a suitable experimental assignment for high-school and<br \/>\nundergraduate courses of physics. We used two vacuum electron-tubes: (a) a double rectifying modern<br \/>\ndiode with an indirectly heated cathode and (b) a specially prepared double diode with a directly<br \/>\nheated cathode and thermocouple. There was a small retarding potential between the cathode and<br \/>\nanode, which gave an opportunity to assume Maxwell\u2019s distribution of the velocities of the emitted<br \/>\nelectrons for the measurement of the electron charge. The electrical scheme for this measurement is<br \/>\nsimple and common electronic devices can be used. We obtained the value for the electron charge<br \/>\n(1.491\u00a0\u00b1\u00a00.036)\u00a0\u00d7\u00a010 \u221219 C if measured on the common commercial double diode vacuum-tube with the<br \/>\nuse of an optical pyrometer and (1.611\u00a0\u00b1\u00a00074)\u00a0\u00d7\u00a010 \u221219 C if measured on the specially prepared<br \/>\ndouble diode vacuum-tube using a thermocouple to determine the cathode temperature. The obtain&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The measurement of the electron charge is a suitable experimental assignment for high-school and<br \/>\nundergraduate courses of physics. We used two vacuum electron-tubes: (a) a double rectifying modern<br \/>\ndiode with an indirectly heated cathode and (b) a spe&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-162257","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/162257","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=162257"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/162257\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=162257"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=162257"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=162257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}