Chemistry Class 11 NCERT Solutions: Chapter 2 Structure of Atom Part 17

Download PDF of This Page (Size: 121K)

Q: 54. If the photon of the wavelength pm strikes an atom and one of its inner bound electrons is ejected out with a velocity of calculate the energy with which it is bound to the nucleus.

Answer:

Energy of incident photon (E) is given by,

Energy of the electron ejected (K.E)

Hence, the energy with which the electron is bound to the nucleus can be obtained as:

Q: 55. Emission transitions in the paschen series end at orbit and start from orbit n and can be represented as

Calculate the value of n if the transition is observed at 1285 nm. Find the region of the spectrum.

Answer:

Wavelength of transition = 1285 nm

(Given)

(Given)

Since

Hence, for the transition to be observed at 1285 nm, n=5.

The spectrum lies in the infrared region.