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a
The radius of first Bohr orbit of deuterium is less than that of hydrogen.
b
The speed of electron in first Balmer line of deuterium is more than that of hydrogen.
c
The wavelength of first Balmer line of deuterium is more than that of hydrogen.
d
The angular momentum of electron in the first Bohr orbit of deuterium is more than that of hydrogen.
answer is A.
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