class 12 physics Bihar Board Class 12 Science all subject Note and PDF vvi objective class 12 physics Dual Nature of Radiation and Matter प्रश्न. प्रोटॉन का विशिष्ट आवेश 9.6x 107 Ckg-1 है । एक एल्फा कण का विशिष्ट आवेश होगा – Read More …
vvi objective class 12 physics Dual Nature of Radiation and Matter Exam 2022