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The total number of atomic orbitals in fourth energy level of an atom is:
A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth ?
A bullet from a gun is fired on a rectangular wooden block with velocity $u$. When the bullet travels $24\text{ cm}$ through the block along its length horizontally, velocity of bullet becomes $u/3$. Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is:
A particle of mass m is thrown upwards from the surface of the earth with a velocity u. The mass and the radius of the earth are, respectively, M and R. G is gravitational constant and g is acceleration due to gravity on the surface of the earth. The minimum value of u so that the particle does not return back to earth is
The number of d-electrons in Fe²⁺ (Z=26) is not equal to the number of electrons in which one of the following?
The number of protons, neutrons and electrons in $^{175}_{71}\text{Lu}$, respectively, are:
A planet moving along an elliptical orbit is closest to the sun at a distance r₁ and farthest away at a distance of r₂. If v₁ and v₂ are the linear velocities at these points respectively, then the ratio v₁/v₂ is:
The radii of the circular orbits of two satellites A and B of the earth are 4R and R, respectively. If the speed of the satellite A is 3v, then the speed of the satellite B will be:
A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = 5.98 × 10²⁴ kg) have to be compressed to be a black hole?
In hydrogen atom, what is the de Broglie wavelength of an electron in the second Bohr orbit? [Given that Bohr radius, $a_0 = 52.9$ pm]
According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
Which one of the following does not exhibit the phenomenon of mutarotation?
A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest:
The figure shows elliptical orbit of a planet m about the sun S. The shaded area SCD is twice the shaded area SAB. If $t_1$ is the time for planet to move from C to D and $t_2$ is the time to move from A to B, then:
In the Hydrogen atom, the energy of the first excited state is – 3.4 eV. Then find out the kinetic energy (K.E.) of the same orbit of the Hydrogen atom:
If the principal quantum number n=6, the correct sequence of filling of electrons will be:
Which of the following is not a fat-soluble vitamin?
The kinetic energies of a planet in an elliptical orbit around the Sun, at positions A, B and C are $K_A$, $K_B$ and $K_C$ respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S, as shown in the figure. Then:
The additional kinetic energy to be provided to a satellite of mass m revolving around a planet of mass M, to transfer it from a circular orbit of radius R₁ to another of radius R₂ (R₂ > R₁) is
Two electrons occupying the same orbital are distinguished by: