1
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
Energy required to remove an electron from aluminium surface is 4.2 eV . If light of wavelength $2000 \mathring{A}$ falls on the surface, the velocity of the fastest ejected electron the surface will be
A
$84 \times 10^5 \mathrm{~ms}^{-1}$
B
$7.4 \times 10^6 \mathrm{~ms}^{-1}$
C
$64 \times 10^5 \mathrm{~ms}^{-1}$
D
$84 \times 10^6 \mathrm{~ms}^{-1}$
2
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
If the binding energy of the electron in a hydrogen atom is 13.6 eV . Then, energy required to remove electron from first excited state of $\mathrm{Li}^{2+}$ is
A
122.4 eV
B
3.4 eV
C
13.6 eV
D
30.6 eV
3
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
A mixture consists of two radioactive materials $A_1$ and $A_2$ with half lives of 20 s and 10 s respectively. Initially, the mixture has 40 g of $A_1$ and 160 g of $A_2$. The amount of the two in the mixture will become equal after
A
60 s
B
80 B
C
20 s
D
408
4
AP EAPCET 2024 - 18th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
If $n_r$ and $n_h$ are concentrations of electron and holes in a semiconductor, then the intrinsic carrier concentration $n_j$ in thermal equilibrium is

AP EAPCET 2024 - 18th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 7 English

A
$n=\sqrt{\frac{n_3}{n_n}}$
B
$n=\frac{n_n}{n_n}$
C
$n=\sqrt{7 b n_n}$
D
$n_1=n_0+n_n$
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