1
AP EAPCET 2024 - 21th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
A blue lamp emits light of mean wavelength $4500$ Å. The lamp is rated at 150 W and $8 \%$ efficiency. Then, the number of photons are emitted by the lamp per second
A
$27.17 \times 10^{18}$
B
$17.17 \times 10^{18}$
C
$27.17 \times 10^{15}$
D
$54 \times 10^{16}$
2
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
If the kinetic energy of a particle in motion is decreased by $36 \%$, the increase in de-Broglie wavelength of the particle is
A
$18 \%$
B
$25 \%$
C
$20 \%$
D
$32 \%$
3
AP EAPCET 2024 - 20th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
An electron of mass $m$ with initial velocity $\mathbf{v}=v_0 \hat{\mathbf{i}}\left(v_0>0\right)$ enters in an electric field $\mathbf{E}=-E_0 \hat{\mathbf{i}}$ ( $E_0$ is constant $>0$ ) at $t=0$. If $\lambda$ is its de-Broglie wavelength initially, then the de-Broglie wavelength after time $t$ is
A
$\frac{\lambda}{1+\frac{e E_d}{m v_0}}$
B
$\frac{\lambda}{\left(1-\frac{e E_d}{m v_0}\right)^2}$
C
$\left(1+\frac{e E_\alpha}{m v_0}\right) \lambda$
D
$\left(1+\frac{e E_d}{m v_0}\right)^2 \lambda$
4
AP EAPCET 2024 - 19th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The longest wavelength of light that can initiate photo electric effect in the metal of work function 9 eV is
A
$1.37 \times 10^{-7} \mathrm{~m}$
B
$1.5 \times 10^{-7} \mathrm{~m}$
C
$3.7 \times 10^{-7} \mathrm{~m}$
D
$4 \times 10^{-7} \mathrm{~m}$
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