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
The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ( λ1 and λ2 ) will be:
1. λ1 = 2λ2
2. λ1 = 4λ2
3. λ1 = λ2
4. λ1 = λ2
Match types of wave in Column-I with the corresponding frequency in Column-II and mark the appropriate option:
Column-I
(Types of Wave)
|
Column-II (Corresponding Frequency) |
||
A. | X-rays | I. | |
B. | Ultraviolet wave (UV) | II. | |
C. | Long radio waves | III. | |
D. | Microwave | IV. |
A | B | C | D | |
1. | IV | I | III | II |
2. | I | IV | II | III |
3. | I | IV | III | II |
4. | IV | III | I | II |
The correct arrangement of the following electromagnetic spectrum in the increasing order of frequency is:
1. | Cosmic rays < Amber light < Radiation of FM radio < X-rays < Radiation from microwave ovens |
2. | Radiation from FM radio < Radiation from microwave oven < Amber light < X- rays < Cosmic rays |
3. | Radiation from microwave ovens < Amber light < Radiation of FM radio < X-rays < Cosmic rays |
4. | Cosmic rays < X-rays < Radiation from microwave ovens < Amber light < Radiation of FM radio |
Photons of wavelength 4000 are used to break molecules. The percentage of energy converted to the kinetic energy of atoms will be :
(bond dissociation energy of the molecule is 246.5 kJ/mol)
1. 12%
2. 8%
3. 26%
4. 17%
The neon gas emits radiation of 616 nm. The number of quanta that are present in 2 J of energy is:
1. \(6.2 \times 10^{-18} \)
2. \(5.6 \times 10^{17} \)
3. \(6.2 \times 10^{18} \)
4. \(32.2 \times 10^{-20}\)