**Related Questions:**

### (1) Show that circumference of the Bohr orbit for hydrogen atom is an integral multiple of the de Broglie wavelength associated with the electron revolving about that orbit.

**Solved Questions:**

### (1) Calculate the energy per mole of photon of electromagnetic radiations of wavelength 4000Å.

**Practice Questions:**

1.** **A photon of light of wavelength 6000 Å has energy E. Calculate the wavelength of photon of a light which has energy/photon 4E.

2. Calculate the wavelength, wave number and frequency of photon having its energy 5 electron volt.

3. Iodine molecule dissociates into atoms after absorbing light of 4500Å. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (Bond energy of I_{2} = 240 kJ mol^{–1})

**Answer Keys: **

1. Lemda-2= 1500 Å

2. 2.475 × 10^{–5} cm, 4.04 × 10^{4} cm, 1.212 × 10^{15} Hz

3. 2.16 × 10^{–20} J

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