A nitrogen laser produces radiation at a wavelength of 337.1 nm. If the number of
photons emitted is 5.6 × 10
24, the power of the laser is:

$1.$ $4.56$ $×$ ${10}^{7}$ $\mathrm{J}$
$2.$ $3.33$ $×$ ${10}^{6}$ $\mathrm{J}$
$3.$ $1.29$ $×$ ${10}^{6}$ $\mathrm{J}$
$4.$ $9.17$ $×$ ${10}^{5}$ $\mathrm{J}$

Subtopic:  Planck's Theory |
74%
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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:

$1.$ ${10}^{2}$
$2.$ $10$
$3.$ $50$
$4.$ $20$

Subtopic:  Planck's Theory |
73%
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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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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 |
63%
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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. 4.13×1016s-1

3 . 7.17×1019 s-1

4 . 1.26 ×1020s-1
${}^{}$

Subtopic:  Planck's Theory |
66%
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The number of photons of light with a wavelength of 4000 pm that provide 1J of energy would be:

$1.$ $2.01$ $×$ ${10}^{16}$
$2.$ $2.01$ $×$ ${10}^{19}$
$3.$ $4.14$ $×$ ${10}^{23}$
$4.$ $2.14$ $×$ ${10}^{21}$

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

$1.$ $8.28$ $×$ ${10}^{-10}$ $\mathrm{J}$
$2.$ $8.24$ $×$ ${10}^{10}$ $\mathrm{J}$
$3.$ $7.12$ $×$ ${10}^{-11}$ $\mathrm{J}$
$4.$ $2.12$ $×$ ${10}^{}$ $10$ $\mathrm{J}$

Subtopic:  Planck's Theory |
55%
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 Assertion (A): A black body is an ideal body that emits and absorbs radiation of all frequencies. Reason (R): The frequency of radiation emitted by a body goes from lower frequency to a higher frequency with an increase in temperature.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.

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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