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141.
Find energy of each of the photons which correspond to light of frequency 3 x 10¹⁵ Hz.

Here v = 3 x 10¹⁵ Hz.

But E = hv
Substituting the values, we have,

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142.

Find energy of each of the photons which have wavelength of 0.50 Å.

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143.

Calcualte the energy of one mole of photons of radiation whose frequency is 5 x 10¹⁴Hz.

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Long Answer Type

144. What is the number of photons of light with a wavelength of 4000 pm that provide 1J of energy?

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Short Answer Type

145.

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

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146. A 25 watt bulb emits monochromatic yellow light of wavelength of 0.57 μm. Calculate the rate of emission of quanta second.

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147.

Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 x 10²⁴, calculate the power of this laser.

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Long Answer Type

148.

Neon gas is generally used in the sign boards. If it emits strongly at 616 nm, calculate: (a) the frequency of emission, (b) distance travelled by this radiation in 30 s (c) energy of quantum and (d) number of quanta present if it produces 2 J of energy.

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Short Answer Type

149. If the energy difference between two electronic states is 214 .68 kJ mol^-1, calculate the frequency of light emitted when an electron drops from higher to lower state. (Planck's constant h = 39. 79 x 10^-14 k Js mol^-1)

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Long Answer Type

150. When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons, are emitted with a kinetic energy of 1.68 X 10⁵ J mol^-1. What is the minimum energy needed to remove an electron from sodium? What is the maximum wavelength that will cause a photoelectron to be emitted?

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