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  88%
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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  85%
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Match the following:

 Column I Column II A. X-rays 1. $\mathrm{v}={10}^{0}-{10}^{4}$ $\mathrm{Hz}$ B. Ultraviolet wave (UV) 2. $\mathrm{v}={10}^{10}$ $\mathrm{Hz}$ C. Long radio waves 3. $\mathrm{v}={10}^{16}$ $\mathrm{Hz}$ D. Microwave 4. $\mathrm{v}={10}^{18}$ $\mathrm{Hz}$

 A B C D 1. 4 1 3 2 2. 1 4 2 3 3. 1 4 3 2 4. 4 3 1 2  75%
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The correct arrangement of the following electromagnetic spectrum in the increasing order of frequency is:  68%
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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%  To view explanation, please take trial in the course.
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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:

$1.$ $6.2$ $×$ ${10}^{-18}$
$2.$ $5.6$ $×$ ${10}^{17}$
$3.$ $6.2$ $×$ ${10}^{18}$
$4.$ $32.2$ $×$ ${10}^{-20}$  Subtopic:  Planck's Theory | Electromagnetic Radiation |
70%
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