A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is: [speed of light, ]
1. | 2192 m | 2. | 21.92 cm |
3. | 219.3 m | 4. | 219.2 m |
The number of angular nodes and radial nodes in 3s orbital are :
1. | 0 and 2, respectively | 2. | 1 and 0, respectively |
3. | 3 and 0, respectively | 4. | 0 and 1, respectively |
1. | The shapes of dxy, dyz, and dzx orbitals are similar to each other; and dx2 -y2 and dz2 are similar to each other. |
2. | All the five 5d orbitals are different in size when compared to the respective 4d orbitals. |
3. | All the five 4d orbitals have shapes similar to the respective 3d orbitals. |
4. | In an atom, all the five 3d orbitals are equal in energy in free state. |
1. | 158.7 Å | 2. | 158.7 pm |
3. | 15.87 pm | 4. | 1.587 pm |
Which one of the following electrons in the ground state will have least amount of energy?
1. | An electron in hydrogen atom. |
2. | An electron in 2p orbital of carbon atom. |
3. | The electron of copper atom present in 4s orbital. |
4. | The outermost electron in sodium atom. |
A monochromatic infrared range finder of power 1milli watt emits photons with wavelength 1000 nm in 0.1 second. The number of photons emitted in 0.1 second is:
(Given: h = \(6.626 \times 10^{-34} J~s\) , c = \(3 \times 10^8 m~s^{-1}, \) Avogadro number = \(6.022 \times 10^{23}\))
1. \(30 \times 10^{37}\)
2. \(5 \times 10^{14} \)
3. \(30 \times 10^{34} \)
4. \(5 \times 10^{11} \)
List-I (quantum number) |
List-II (Orbital) |
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(A) | n = 2, \(\ell\) = 1 | (I) | 2s |
(B) | n = 3, \(\ell\) = 2 | (II) | 3s |
(C) | n = 3, \(\ell\) = 0 | (III) | 2p |
(D) | n = 2, \(\ell\) = 0 | (IV) | 3d |
(A) | (B) | (C) | (D) | |
1. | (III) | (IV) | (I) | (II) |
2. | (IV) | (III) | (I) | (II) |
3. | (IV) | (III) | (II) | (I) |
4. | (III) | (IV) | (II) | (I) |