Practice Set 1
A beam of electrons of energy E scatters from a target having atomic spacing of 1 Å. The first maximum intensity occurs at θ = 60°. Then E (in eV) is ______. (Planck constant h = 6.64 × 10^–34 Js, 1 eV = 1.6 × 10^–19 J, electron mass m = 9.1 × 10^–31 kg)
19
Sep
A beam of electrons of energy E scatters from a target having atomic spacing of 1 Å. The first maximum intensity occurs at θ = 60°. Then E (in eV) is ______. (Planck constant h = 6.64 × 10^–34 Js, 1 eV = 1.6 × 10^–19 J, electron mass m = 9.1 × 10^–31 kg) [...]
A solid sphere of radius R carries a charge Q + q distributed uniformly over its volume. A very small point like piece of it of mass m gets detached from the bottom of the sphere and falls down vertically under gravity. This piece carries charge q. If it acquires a speed v when it has fallen through a vertical height y (see figure), then : (assume the remaining portion to be spherical).
19
Sep
A solid sphere of radius R carries a charge Q + q distributed uniformly over its volume. A very small point like piece of it of mass m gets detached from the bottom of the sphere and falls down vertically under gravity. This piece carries charge q. If it acquires a speed v when it [...]
A hollow spherical shell at outer radius R floats just submerged under the water surface. The inner radius of the shell is r. If the specific gravity of the shell material is 27/8 with respect to water, the value of r is
19
Sep
A hollow spherical shell at outer radius R floats just submerged under the water surface. The inner radius of the shell is r. If the specific gravity of the shell material is 27/8 with respect to water, the value of r is The value of current i1 flowing from A to C in the circuit [...]
With increasing biasing voltage of a photodiode, the photocurrent magnitude
19
Sep
With increasing biasing voltage of a photodiode, the photocurrent magnitude the photocurrent magnitude With increasing biasing voltage of a photodiode September 19, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,
In a resonance tube experiment when the tube is filled with water up to a height of 17.0 cm from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of 24.5 cm. If the velocity of sound in air is 330 m/s, the tuning fork frequency is
19
Sep
In a resonance tube experiment when the tube is filled with water up to a height of 17.0 cm from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of 24.5 cm. If the velocity of sound in [...]
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In a resonance tube experiment when the tube is filled with water up to a height of 17.0 cm from bottom ,
it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of 24.5 cm. If the velocity of sound in air is 330 m/s ,
the tuning fork frequency is ,
Activities of three radioactive substances A, B and C are represented by the curves A, B and C, in the figure. Then their half-lives T 1/2 (A) : T 1/2 (B) : T 1/2 (C) are in the ratio
19
Sep
Activities of three radioactive substances A, B and C are represented by the curves A, B and C, in the figure. Then their half-lives T 1/2 (A) : T 1/2 (B) : T 1/2 (C) are in the ratio Activities of three radioactive substances A B and C are represented by the curves A b [...]
A square loop of side 2a and carrying current I is kept in xy plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point (0, b, 0), (b >> a). The magnitude of torque on the loop about z-axis will be
19
Sep
A square loop of side 2a and carrying current I is kept in xy plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point (0, b, 0), (b >> a). The magnitude of torque on the loop about z-axis will be (b [...]
A helicopter rises from rest on the ground vertically upwards with a constant acceleration g. A food packet is dropped from the helicopter when it is at a height h. The time taken by the packet to reach the ground is close to [g is the acceleration due to gravity]
19
Sep
A helicopter rises from rest on the ground vertically upwards with a constant acceleration g. A food packet is dropped from the helicopter when it is at a height h. The time taken by the packet to reach the ground is close to [g is the acceleration due to gravity] The value of current i1 [...]
The value of the acceleration due to gravity is g1 at a height h = R/2 (R = radius of the earth) from the surface of the earth. It is again equal to g1 at a depth d below the surface of the earth. The ratio ( d/R) equals
19
Sep
The value of the acceleration due to gravity is g1 at a height h = R/2 (R = radius of the earth) from the surface of the earth. It is again equal to g1 at a depth d below the surface of the earth. The ratio ( d/R) equals The value of current i1 flowing [...]
Two capacitors of capacitances C and 2C are charged to potential differences V and 2V, respectively. These are then connected in parallel in such a manner that the positive terminal of one is connected to the negative terminal of the other. The final energy of this configuration is
19
Sep
Two capacitors of capacitances C and 2C are charged to potential differences V and 2V, respectively. These are then connected in parallel in such a manner that the positive terminal of one is connected to the negative terminal of the other. The final energy of this configuration is respectively. These are then connected in parallel [...]