An electron is moving in 4th orbit and its de-Broglie wavelength is λ. What is the circumference of the fourth orbit?
2/λ
2λ
4λ
4/λ
A
2/λ
B
4/λ
C
4λ
D
2λ
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Solution
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Bohr's model says that, mvr=nh/2π. As per DeBroglie's theory, λ=h/mv. Therefore, 2πr=nh/mv=nλ. DeBroglie's Wavelength of electron in 4th orbit =λ. Therefore circumference of 4th orbit =4λ.
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