1
TS EAMCET 2023 (Online) 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Electromagnetic radiation of intensity $0.6 \mathrm{Wm}^{-2}$ is falling on a black surface. The radiation pressure on the surface is

A

$2 \times 10^{-9} \mathrm{Nm}^{-2}$

B

$3 \times 10^{-9} \mathrm{Nm}^{-2}$

C

$4 \times 10^{-9} \mathrm{Nm}^{-2}$

D

$6 \times 10^{-9} \mathrm{Nm}^{-2}$

2
TS EAMCET 2023 (Online) 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Radiations of wavelength 400 nm incidents on a photosensitive material of work function 2.2 eV . The stopping potential is nearly

A

0.9 V

B

0.5 V

C

0.4 V

D

0.1 V

3
TS EAMCET 2023 (Online) 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a hypothetical Bohr hydrogen atom, if the mass of the electron is doubled then the energy of the electron in the first orbit is

A

-27.2 eV

B

-13.6 eV

C

-6.8 eV

D

-3.4 eV

4
TS EAMCET 2023 (Online) 14th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The half-life period of element $X$ is same as the mean life time of element $Y$. Assume initially $X$ and $Y$ have same number of atoms. Then

A

Initially $X$ and $Y$ have same decay rates

B

Always $X$ and $Y$ decay at same rate

C

$Y$ decay faster than $X$

D

$X$ decays faster than $Y$

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