The energy of the photon having frequency 3×1015 Hz would be
1. 1.988 × ${10}^{-18}$ J
2. 1.588 × ${10}^{-18}$ J
3. 1.288 × ${10}^{-18}$ J
4. 2.988 × ${10}^{-18}$ J

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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$\frac{1}{2}$λ2

4. λ1 = λ2

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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
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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

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Photons of wavelength 4000  ${A}^{o}$ are used to break ${\mathrm{l}}_{2}$ 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%

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The neon gas emits radiation of 616 nm. The number of quanta that are present in 2 J of energy is

Subtopic:  Planck's Theory | Electromagnetic Radiation |
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