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बोहर मॉडल के अनुसार सूर्य के चारों ओर `1.5xx10^(11)` मीटर त्रिज्या की कक्षा में, `3xx10^(4)` मीटर/सेकण्ड के कक्षीय वेग से परिक्रमा करती पृथ्वी की अभिलाक्षणिक क्वांटम संख्या ज्ञात कीजिए (पृथ्वी है द्रव्यमान `=6.0xx10^(24)` किग्रा)।

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बोहर मॉडल के अनुसार, पृथ्वी का सूर्य के चारों ओर कोणीय संवेग,
`"m v r"=("nh")/(2pi)`
क्वाण्टम संख्या,
`n=("m v r"xx2pi)/(h)`
`=((6.0xx10^(24))xx(3xx10^(4))xx(1.5xx10^(11))xx2xx3.14)/(6.63xx10^(-34))`
`=2.56xx10^(74)`.

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