Calculate the radius of the fourth Bohr’s orbit of hydrogen at

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Structure of Atom

Short Answer Type

41.

Give Balmer equation.

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42.

What is Bohr's radius?

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43.

Give an expression to calculate the radius of an orbit.

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44.

What is the region of light in which Lyman and Balmer series fall?

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45.

What are stationary states?

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46.

What is Zeeman effect?

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47.

What is Stark effect?

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48.
Calculate the radius of the fourth Bohr’s orbit of hydrogen atom.

Calcualtion of the radius of the fourth Bohr's orbit of hydrogen atom.
Radius of the orbits in hydrogen atom (r) given by,
n² = x 0.529Å
∴ Radius of the fourth orbit
= (4)² x 0.529A = 8.48Å

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49.

When white light that has passed through sodium vapours in viewed through a spectroscope, the observed spectrum has dark line at 5890Å. Explain this observation.

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50.

What is quantisation of energy?

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