railway RRB Technician Grade 1 Mock Test 2024 Electronic Devices PN Junction

अवक्षय क्षेत्र में शामिल है :

1
मुक्त इलेक्ट्रॉन
2
ऋणात्मक तथा धनात्मक आयन
3
होल
4
फोटान
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