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Chapter :
MODERN PHYSICS
Topic :
PHOTO ELECTRIC EFFECT
Difficulty Level :
Level 6 [JEE ADV]
Type of Problem :
Single
Question :

A disc shaped photoelectric detector of area 0.5 cm² generates current when light of frequency > that of yellow light falls on it. The photoelectron generation efficiency is 20%. In the arrangement shown, S is an isotropic 100 watt point monochromatic light source with λ = 4000 A. The focal of the lens is 20 cm and its circular area is 4 cm². Find the photocurrent in the detector assuming all rays to be paraxial w.r.t. lens.

The source is at a distance of 30cm on the left on the lens and the detector is at a distance of 90cm on the right of the lens 

Posted By
Hardik
Posted On
25 Mar 2025
No Of Points
50
Attempted
3
Percentage
67
Posted On
25 Mar 2025
Chapter :
MECHANICS
Topic :
GRAVITATION
Difficulty Level :
Level 10 [OLY / INPHO / IPHO]
Type of Problem :
Single
Description / Name of the Questions :

EARTH COMET ENCOUNTER

Question :

     

Posted By
dd
Posted On
04 Mar 2025
No Of Points
90
Attempted
16
Percentage
13
Posted On
04 Mar 2025
Chapter :
MECHANICS
Topic :
KINEMATICS
Difficulty Level :
Level 4 [JEE ADV]
Type of Problem :
Multiple
Question :

Posted By
Sanat R
Posted On
27 Feb 2025
No Of Points
30
Attempted
29
Percentage
55
Posted On
27 Feb 2025
Chapter :
MECHANICS
Topic :
KINEMATICS
Difficulty Level :
Level 9 [OLY / INPHO / IPHO]
Type of Problem :
Single
Question :

After being kicked by a footballer, a ball started to
fly straight towards the goal at velocity v m/s making
an angle α with the horizontal. Due to side wind
blowing at um/s perpendicular the initial velocity of the
ball, the ball had deviated from its initial course by sm by
the time it reached the plane of the goal. Find the time that
it took the ball to reach the plane of the goal, if the goal was
situated at distance L metres from the footballer.

Posted By
Archit
Posted On
23 Feb 2025
No Of Points
80
Attempted
16
Percentage
75
Posted On
23 Feb 2025
Chapter :
ELECTRO-MAGNETISM
Topic :
ELECTROSTATICS
Difficulty Level :
Level 4 [JEE ADV]
Type of Problem :
Multiple
Question :

.

Posted By
hi
Posted On
16 Feb 2025
No Of Points
30
Attempted
43
Percentage
2
Posted On
16 Feb 2025