1
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The de Broglie wavelength of an electron having kinetic energy $\mathrm{E}$ is $\lambda$. If the kinetic energy of electron becomes $\frac{E}{4}$, then its de-Broglie wavelength will be :
A
$\sqrt{2} \lambda$
B
$2 \lambda$
C
$\frac{\lambda}{2}$
D
$\frac{\lambda}{\sqrt{2}}$
2
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The height of transmitting antenna is $180 \mathrm{~m}$ and the height of the receiving antenna is $245 \mathrm{~m}$. The maximum distance between them for satisfactory communication in line of sight will be :

(given $\mathrm{R}=6400 \mathrm{~km})$
A
$104 \mathrm{~km}$
B
$56 \mathrm{~km}$
C
$48 \mathrm{~km}$
D
$96 \mathrm{~km}$
3
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In a linear Simple Harmonic Motion (SHM)

(A) Restoring force is directly proportional to the displacement.

(B) The acceleration and displacement are opposite in direction.

(C) The velocity is maximum at mean position.

(D) The acceleration is minimum at extreme points.

Choose the correct answer from the options given below:
A
${\text {(A), (B) and (D) only }}$
B
(C) and (D) only
C
(A), (B) and (C) Only
D
(A), (C) and (D) only
4
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two identical particles each of mass ' $m$ ' go round a circle of radius $a$ under the action of their mutual gravitational attraction. The angular speed of each particle will be :
A
$\sqrt{\frac{G m}{2 a^{3}}}$
B
$\sqrt{\frac{G m}{a^{3}}}$
C
$\sqrt{\frac{G m}{8 a^{3}}}$
D
$\sqrt{\frac{G m}{4 a^{3}}}$
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