Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Structure of Atom

Short Answer Type

141.

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

206 Views

142.

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

223 Views

143.
Calcualte the energy of one mole of photons of radiation whose frequency is 5 x 10¹⁴Hz.

Energy (E) of one photon = hv
Here, h = 6.626 x 10^-34Js
v = 5 x 10¹⁴s^-1

197 Views

Long Answer Type

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

209 Views

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.

361 Views

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

250 Views

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.

226 Views

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.

236 Views

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)

333 Views

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?

458 Views