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 the following:
Column I | Column II | ||
A. | X-rays | 1. | |
B. | Ultraviolet wave (UV) | 2. | |
C. | Long radio waves | 3. | |
D. | Microwave | 4. |
A | B | C | D | |
1. | 4 | 1 | 3 | 2 |
2. | 1 | 4 | 2 | 3 |
3. | 1 | 4 | 3 | 2 |
4. | 4 | 3 | 1 | 2 |
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. \(32.2 \times 10^{-20}\)