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A small ring P is threaded on a smooth wire bent in the form of a circle of radius a and center O. The wire is rotating with constant angular speed ω about a vertical diameter XY while the ring remains at rest relative to the wire at a distance a/2 from XY. Then ω^2 is equal to
20
Oct
A small ring P is threaded on a smooth wire bent in the form of a circle of radius a and center O. The wire is rotating with constant angular speed ω about a vertical diameter XY while the ring remains at rest relative to the wire at a distance a/2 from XY. Then ω^2 [...]
A certain radioactive material can undergo three different types of decay, each with a different decay constant lemda, 2 lemda, and 3 lemda. Then, the effective decay constant lemda eff is
20
Oct
A certain radioactive material can undergo three different types of decay, each with a different decay constant lemda, 2 lemda, and 3 lemda. Then, the effective decay constant lemda eff is 2 lemda A certain radioactive material can undergo three different types of decay and 3 lemda. Then each with a different decay constant lemda [...]
92U238 changes to 85At210 by a series of alpha and beta decays. Find the number of alpha decays undergone (an integer).
20
Oct
92U238 changes to 85At210 by a series of alpha and beta decays. Find the number of alpha decays undergone (an integer). 92U238 changes to 85At210 by a series of alpha and beta decays. Find the number of alpha decays undergone (an integer). October 20, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP [...]
A radioactive sample decays through two different decay processes alpha decay and beta decay. Half-life time for alpha decay is 3 h and half-life time for beta decay is 6 h. What will be the ratio of number
20
Oct
A radioactive sample decays through two different decay processes alpha decay and beta decay. Half-life time for alpha decay is 3 h and half-life time for beta decay is 6 h. What will be the ratio of number In Column 1 some of the nuclear reactions are given. Match this with the energy involved in [...]
A radioactive sample decays with an average-life of 20 ms. A capacitor of capacitance 100 micro F i charged to some potential and then the plates are connected through a resistance R.
20
Oct
A radioactive sample decays with an average-life of 20 ms. A capacitor of capacitance 100 micro F i charged to some potential and then the plates are connected through a resistance R. A radioactive sample decays with an average-life of 20 ms. A capacitor of capacitance 100 micro F i charged to some potential and [...]
A square loop PQRS of side ‘a’ and resistance ‘r’ is placed near an infinitely long wire carrying a constant current I. The sides PQ and RS are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by 180∘ about an axis parallel to the long wire and passing through the mid points of the side QR and PS. The total amont of charge which passes through any point of the loop during rotation is:
20
Oct
A square loop PQRS of side ‘a’ and resistance ‘r’ is placed near an infinitely long wire carrying a constant current I. The sides PQ and RS are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by 180∘ about an axis parallel to the long [...]
A radioactive sample has 8.0 * 10^18 active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-lives (in * 10^18)?
20
Oct
A radioactive sample has 8.0 * 10^18 active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-lives (in * 10^18)? A radioactive sample has 8.0 * 10^18 active nuclei at a certain instant. How many of these nuclei will still be in the active [...]
Figure shown a wooden block at rest in equilibrium on a rough horizontal plane being acted upon by force F1=10N,F2=2N, as shown .If F1 is removed , the resulting force acting on the block will be
20
Oct
Figure shown a wooden block at rest in equilibrium on a rough horizontal plane being acted upon by force F1=10N,F2=2N, as shown .If F1 is removed , the resulting force acting on the block will be as shown .If F1 is removed F2=2N Figure shown a wooden block at rest in equilibrium on a rough [...]
A block mass m is kept on an inclined plane of a lift moving down with acceleration of 2 ms^−2 . What should be minimum coefficient of friction to let the block move down with constant velocity?
20
Oct
A block mass m is kept on an inclined plane of a lift moving down with acceleration of 2 ms^−2 . What should be minimum coefficient of friction to let the block move down with constant velocity? A block mass m is kept on an inclined plane of a lift moving down with acceleration of [...]
A lift is moving upwards with a uniform velocity v in which a block of mass m is lying. The frictional force offered by the block, when coefficient of friction is μ = 0.5 will be :-
20
Oct
A lift is moving upwards with a uniform velocity v in which a block of mass m is lying. The frictional force offered by the block, when coefficient of friction is μ = 0.5 will be :- A lift is moving upwards with a uniform velocity v in which a block of mass m is [...]