The number of photons of light with a wavelength of 4000 pm that provide 1J of energy would be 

1. 2.01 × 10162. 2.01 × 10193. 4.14 × 10234. 2.14 × 1021

Subtopic:  Planck's Theory |
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Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise sodium atom. The ionisation energy of sodium in kJ mol-1 is -

1. 494

2. 4.94

3. 516

4. 0.50

Subtopic:  Planck's Theory |
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A 25-watt bulb emits monochromatic yellow light with a wave length of 0.57µm. The rate of emission of quanta per second would be
1. 7.17 × 10-19 s-1
2. 4.13 × 1016 s-1
3. 7.17 × 1019 s-1
4. 1.26 × 1020 s-1

Subtopic:  Planck's Theory |
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A nitrogen laser produces radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 × 1024, the power of the laser is:

1. 4.56 × 107 J2. 3.33 × 106 J3. 1.29 × 106 J4. 9.17 × 105 J

Subtopic:  Planck's Theory |
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If the photon detector receives a total of 3.15×10-18 J from the radiation of 600 nm, the number of photons received by the detector would be 

1. 1022. 103. 504. 20

Subtopic:  Planck's Theory |
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A radiation source emitted  2.5 × 1015 photons in 2 nanoseconds. Energy of the source is -

1. 8.28 × 10-10 J2. 8.24 × 1010 J3. 7.12 × 10-11 J4. 2.12 × 10 10 J

Subtopic:  Planck's Theory |
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The wavelength of the light emitted when the electron returns to the ground state in the H atom, from n = 5 to n = 1, would be: (The ground-state electron energy is –2.18 × 10-18 j)
1. Wavelength = 9.498 x 10-8 km
2. Wavelength = 12.498 x 10-8 m
3. Wavelength = 9.498 x 10-8 m
4. Wavelength = 9.498 x 10-8 cm

Subtopic:  Planck's Theory |
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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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