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  • Which are in the ascending order of wavelength?Option: 1 X-rays, cosmic rays, -rays.  </

Which are in the ascending order of wavelength?

Option: 1

X-rays, cosmic rays, \gamma-rays.
 


Option: 2

\mathrm{H_{(3 \rightarrow 2)}, H_{(4 \rightarrow 2)}, H_{(5 \rightarrow 2)} \cdots} lines in Balmer series of hydrogen atom.


Option: 3

Lyman limit, Balmer limit, and paschen limit in the hydrogen spectrum.


Option: 4

Blue, violet, yellow, red colour in the solar spectrum.


Answers (1)

best_answer

(a) Wavelength increase in the order

Cosmic rays < \gamma-rays < X-rays

(b) In Balmer series :-

\begin{aligned} & \underset{\lambda=656.3 \mathrm{~nm}}{\mathrm{H_{(3 \rightarrow 2)}}}>\underset{486.1 \mathrm{~nm}}{\mathrm{H_{(4 \rightarrow 2)}}}>\underset{434.1 \mathrm{~nm}}{\mathrm{H_{(5 \rightarrow 2)}}} \end{aligned}

(c) Ascending order of wavelength:

Lyman series in UV region <Balmer series region, in Visible < Paschen series in IR region.


(d) \mathrm{\lambda_{\text {Red }}>\lambda_{\text {yellow }}>\lambda_{\text {Blue }}>\lambda \: violet .}

Option (3) is correct.

Posted by

Suraj Bhandari

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