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De Broglie's Hypothesis

Number of spe...

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Number of spectral lines falling in Balmer series whenelectrons are de-excited from nth shell will be givenas(1) (n- 2) in UV(2) (n- 2) in visible region(3) (n-3) in near IR(4) (n-3) in far IR

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Q. Electrons are excited form

n = 1

n = 4

state. During downward transitions, possible number of spectral lines observed in Balmer series is.

Q. An electron in H-atom in N shell on de excitation maximum number of spectral lines produced will be:

Q. Assertion :In

L i^{2 +}

sample, if an electron makes transition from higher state to n=2, then the photon observed will fall in the visible range. Reason: Line falling in n=2 is Balmer series line may belong to visible range H-atom.

Q. How many spectral lines are seen for hydrogen atom when electron jump from

n_{2} = 5

n_{1} = 1

in visible region?

Q. Match the following:

\begin{matrix} List - I & List - II (A) n = 6 \to n = 3 (In H- atoms) & (p) 10 lines in the spectrum (B) n = 7 \to n = 3 (In H atoms) & (q) Spectral lines in visible region (C) n = 5 \to n = 2 (In H-atoms) & (r) 6 lines in the spectrum (D) n = 5 \to n = 1 (In H-atoms) & (s) Spectral lines in infrared region (t) Spectral lines in U.V. region \end{matrix}

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