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1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A certain gas absorbs photon of wavelength $4.0 \times 10^{-7} \mathrm{~m}$ and emits radiation at two wavelengths. If one of the emissions occurs at $7.5 \times 10^{-7} \mathrm{~m}$, what is the wavelength at which the second emission occurs?
A
650 nm
B
857 nm
C
700 nm
D
680 nm
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What is the wave number (Units $$\mathrm{cm}^{-1}$$) of the longest wave length transition in the Balmer series of Hydrogen spectrum? $$Z=1 \text { for } H$$

A
27419.6
B
15233
C
39605.6
D
1354
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0
What are the Principal & Azimuthal quantum number values of the valence electrons in tripositive Lutetium?

A
$$ \mathrm{n}=4 \quad \& \quad 1=2 $$
B
$$ \mathrm{n}=5 \quad \& \quad 1=2 $$
C
$$ \mathrm{n}=5 \quad \& \quad 1=3 $$
D
$$ n=4 \quad \& \quad 1=3 $$
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The correct sequence of filling of electrons in $$n=6$$ is:

A
$$ n s \rightarrow(n-1) d \rightarrow(n-2) f \rightarrow n p $$
B
$$ n s \rightarrow n p \rightarrow(n-1) d \rightarrow(n-2) f $$
C
$$ n s \rightarrow(n-2) f \rightarrow n p \rightarrow(n-1) d $$
D
$$ n s \rightarrow(n-2) f \rightarrow(n-1) d \rightarrow n p $$
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