Books by Author Lovekush Kumar
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Recent Articles
Hydrogen atom is bombarded with electrons accelerated through a potential different of V, which causes excitation of hydrogen atoms. If the experiment is being performed at T = 0 K. The minimum potential difference needed to observe any Balmer series lines in the emission spectra will be alpha * V /10 , where value of alpha is ? JEE 2024
Required energy is for exciting electron to orbit number 3.
A horizontal straight wire 5 m long extending from east to west falling freely at right angle to horizontal component of earth’s magnetic field 0.60 × 10^–4 Wb per m^2. The instantaneous value of emf induced in the wire when its velocity is 10 meter per second is ? JEE 2024
An electric field is given by (6i + 5j +3k) N/C. The electric flux through a surface area 30ˆi m^2 lying in YZ-plane (in SI unit) is : JEE 2024
N moles of a polyatomic gas (f = 6) must be mixed with two moles of a monoatomic gas so that the mixture behaves as a diatomic gas. The value of N is : JEE 2024
Finally diatomic so take F=5 as degree of freedom for diatomic is 5 .
A particle is moving in a straight line. The variation of position ‘x’ as a function of time ‘t’ is given as x = (t^3 – 6t^2 + 20t + 15) m. The velocity of the body when its acceleration becomes zero is :
To find velocity v, we first need the relation between v and t .
to know time for a=0 we need relation between a and t .
A plane electromagnetic wave of frequency 35 MHz travels in free space along the X-direction. At a particular point (in space and time) E = 9.6 jˆ V /m. The value of magnetic field at this point is : JEE 2024
A planet takes 200 days to complete one revolution around the Sun. If the distance of the planet from Sun is reduced to one fourth of the original distance, how many days will it take to complete one revolution ?
A wire of length L and radius r is clamped at one end. If its other end is pulled by a force F, its length increases by l. If the radius of the wire and the applied force both are reduced to half of their original values keeping original length constant, the increase in length will become ? JEE 2024
Two metallic wires P and Q have same volume and are made up of same material. If their area of cross sections are in the ratio 4 : 1 and force F1 is applied to P, an extension of delta l is produced. The force which is required to produce same extension in Q is F2. Find the ratio of F1 and F2. JEE 2024
K is corresponding spring constant for a wire for easing the calculation using F=-kx
Y is young's modulus of elasticity.
A small liquid drop of radius R is divided into 27 identical drops. If the surface tension is T, then the work done in the process will be : JEE 2024
