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

Subtopic:  Electromagnetic Radiation |
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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 |
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Match the following:

Column I Column II
A. X-rays 1. v=100-104 Hz
B. Ultraviolet wave (UV) 2. v=1010 Hz
C. Long radio waves 3. v=1016 Hz
D. Microwave 4. v=1018 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
Subtopic:  Electromagnetic Radiation |
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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 |
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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 × 10-182. 5.6 × 10173. 6.2 × 10184. 32.2 × 10-20

Subtopic:  Planck's Theory | Electromagnetic Radiation |
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