1
TG EAPCET 2025 (Online) 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Photons of energy 4.5 eV are incident on a photosensitive material of work function 3 eV . The de-Broglie wavelength associated with the photoelectrons emitted with maximum kinetic energy is nearly

A

$10 \mathop {\rm{A}}\limits^{\rm{o}}$

B

$5 \mathop {\rm{A}}\limits^{\rm{o}}$

C

$20 \mathop {\rm{A}}\limits^{\rm{o}}$

D

$15 \mathop {\rm{A}}\limits^{\rm{o}}$

2
TG EAPCET 2025 (Online) 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the difference in the frequencies of the first and second lines of Lyman series of hydrogen atom is $f$, then the difference in frequencies of the first and second lines of Balmer series of hydrogen atom is

A

$\frac{3 f}{4}$

B

$f$

C

$\frac{7 f}{20}$

D

$\frac{9 f}{16}$

3
TG EAPCET 2025 (Online) 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The average energy of a neutron produced in the fission of ${ }_{92}^{235} \mathrm{U}$ is

A

$160 \times 10^{-13} \mathrm{~J}$

B

$320 \times 10^{-15} \mathrm{~J}$

C

$320 \times 10^{-13} \mathrm{~J}$

D

$160 \times 10^{-15} \mathrm{~J}$

4
TG EAPCET 2025 (Online) 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $96.875 \%$ of a radioactive substance decays in 10 days, then the half life of the substance is (in days)

A

10

B

5

C

4

D

2

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