The energy of the photon with a frequency of 3 × 1015 Hz is:

1. 1.988 × 10-18 J
2. 1.588 × 10-18 J
3. 1.288 × 10-18 J
4. 2.988 × 10-18 J

Subtopic:  Electromagnetic Radiation |
 90%
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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. λ112λ2

4. λ1 = λ2

Subtopic:  Electromagnetic Radiation |
 86%
From NCERT
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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.  v=100-104 Hz
B. Ultraviolet wave (UV) II.  v=1010 Hz
C. Long radio waves III.  v=1016 Hz
D. Microwave IV.  v=1018 Hz
   
A B C D
1. IV I III II
2. I IV II III
3. I IV III II
4. IV III I II
Subtopic:  Electromagnetic Radiation |
 77%
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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

Subtopic:  Electromagnetic Radiation |
 72%
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Photons of wavelength 4000  Ao are used to break l2 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%

Subtopic:  Electromagnetic Radiation |
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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. \(6.2 \times 10^{-18} \)
2. \(5.6 \times 10^{17} \)
3. \(6.2 \times 10^{18} \)
4. \(32.2 \times 10^{-20}\)

Subtopic:  Planck's Theory | Electromagnetic Radiation |
 72%
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