Uncertainty in position of a and He is similar. If uncertainty in momentum of is , then uncertainty in momentum of He will be:
1. | 32×105 | 2. | 16×105 |
3. | 8×105 | 4. | None of the above |
In the Hydrogen atom, the energy of the first excited state is – 3.4 eV. Then find out K.E(kinetic energy) of the same orbit of the Hydrogen atom:
1. + 3.4 eV
2. + 6.8 eV
3. – 13.6 eV
4. + 13.6 eV
The value of Planck's constant is 6.63 × 10–34 J s. The velocity of light is 3.0 × 108 m s–1. The closest value to the wavelength in nanometers of a quantum of light with a frequency of is:
1.
2.
3.
4.
The mass and charge of one mole of electrons are, respectively:
1. 5.48 × kg, 9.65 C,
2. 5.48 × C, 1.098 x 1027
3. 5.48 × kg, 9.65 × C
4. 9.65 × C, 1.098 x 1027
The period in the modern periodic table indicates the value of :
1. Atomic number
2. Atomic mass
3. Principal quantum number
4. Azimuthal quantum number.
The number of orbitals indicated by the following set of quantum numbers, n = 3, l = 2, m =+2 is:
1. 1
2. 2
3. 3
4. 4
The maximum number of neutrons are present in the nuclei of
The complete symbol for the atom with the given atomic number (Z) and atomic mass (A) would be, respectively,
i. | Z = 17 , A = 35. |
ii. | Z = 92 , A = 233. |
iii. | Z = 4 , A = 9. |
1.
2.
3.
4.
Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm.
The frequency (ν) and wave number of this yellow light would be, respectively:
1. 517 x 1014 s-1 , 172 x 106 m-1
2. 6.17 x 1014 s-1 , 1.72 x 106 m-1
3. 4.17 x 1014 s-1 , 2.72 x 106 m-1
4. 5.17 x 1014 s-1 , 1.72 x 106 m-1
The energy of the photon with a frequency of 3×1015 Hz is :
1. 1.988 × J
2. 1.588 × J
3. 1.288 × J
4. 2.988 × J