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आधुनिक भौतिकी, दिशा प्रकाशन द्वारा : जेईई मेन और उन्नत परीक्षा हेतु पीडीऍफ़ बुक | Modern Physics by Disha Publication : For JEE Main and Advanced Exam PDF Book

आधुनिक भौतिकी, दिशा प्रकाशन द्वारा : जेईई मेन और उन्नत परीक्षा हेतु पीडीऍफ़ बुक | Modern Physics by Disha Publication : For JEE Main and Advanced Exam PDF Book


Modern-Physics-by-Disha-Publication-For-JEE-Main-and-Advanced-Exam-PDF-Book


Name of Book :  Modern Physics / आधुनिक भौतिकी 

Hope This Modern Physics Book will Step up you to Succeed / आशा करते हैं आधुनिक भौतिकी पुस्तक आपके कदम सफलता की ओर ले जायगी

Language of Book : English

Size of Ebook : 10.1 MB

Total pages in ebook : 142

Ebook Downloading Status  : Best 
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Description about eBook : DISCHARGE THROUGH GASES AT LOW PRESSURE

At normal pressure, gases are poor conductor of electricity because they have very few charged particles for conduction. These charged particles are produced due to cosmic rays. When a potential difference is applied across the discharge tube, the charged particles start accelerating. At low pressure these charged particles can move a considerable distance and acquire enough energy to ionize the other molecules after collisions. The free electrons and positive ions are produced inside the discharge tube, and conduction starts between electrodes fitted in the tube. When pressure inside the discharge tube decreases gradually from 10 mm of mercury to 0.1 mm of mercury, Crookes dark space, Cathode glow, Faraday dark space and then alternate dark and bright bands are observed. At the pressure of 10–3 mm of mercury, the molecules of the gas ionize and the free electrons move towards anode. The positive ions hit the cathode and cause emission of electrons from cathode. These emitted electrons also move towards anode. Thus cathode rays in the discharge tube are the stream of electrons produced due to collisions. Cathode rays were discovered by Sir William Crookes............

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