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1
AP EAPCET 2024 - 21th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
If $\lambda_0$ and $\lambda$ are respectively the threshold wavelength and wavelength of incident light the velocity of photo electrons ejected from the metal surface is
A
$\sqrt{\frac{2 h}{m}\left(\lambda_0-\lambda\right)}$
B
$\sqrt{\frac{2 h c}{m}\left(\frac{\lambda_0-\lambda}{\lambda \lambda_0}\right)}$
C
$\sqrt{\frac{2 h c}{m}\left(\lambda_0-\lambda\right)}$
D
$\sqrt{\frac{2 h}{m}\left(\frac{1}{\lambda_0}-\frac{1}{\lambda}\right)}$
2
AP EAPCET 2024 - 21th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
The energy of third orbit of $\mathrm{Li}^{2+}$ ion (in J ) is
A
$-2.18 \times 10^{-18}$
B
$-6.54 \times 10^{-18}$
C
$-7.3 \times 10^{-19}$
D
$+2.18 \times 10^{-18}$
3
AP EAPCET 2024 - 21th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The number of $d$ electrons in Fe is equal to which of the following?

(i) Total number of ' $s$ ' electrons of Mg .

(ii) Total number of ' $p$ ' electrons of Cl .

(iii) Total number of ' $p$ ' electrons of Ne .

The correct option is

A
(i), (ii) only
B
(ii), (iii) only
C
(i), (iii) only
D
(i), (ii), (iii)
4
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
If uncertainty in position and momentum of an electron are equal, then uncertainty in its velocity is
A
$\frac{1}{2 m} \sqrt{\frac{h}{\pi}}$
B
$\frac{1}{m} \sqrt{\frac{h}{\pi}}$
C
$\sqrt{\frac{h}{\pi}}$
D
$m \sqrt{\frac{h}{\pi}}$
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