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Physics · PYQ NEET UG 2023
हिन्दीThe radius of inner most orbit of hydrogen atom is \( 5.3 \times 10^{-11}\text{ m} \). What is the radius of third allowed orbit of hydrogen atom?
Correct answer · Option 2
\( 4.77\text{ \AA} \)
Explanation
Radius of \( n \)-th orbit \( r_n = n^2 r_1 \). For \( n = 3 \), \( r_3 = 3^2 \times (5.3 \times 10^{-11}\text{ m}) = 9 \times 0.53\text{ \AA} = 4.77\text{ \AA} \).
