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CBSE Class 12th Physics Notes: Dual Nature of Radiation and ...

Jan 19, 2017 ... CBSE class 12 chapter wise notes based on chapter 11, Dual Nature of Radiation and Matter, of class 12 NCERT Physics textbook are available in this article. ... Photoelectric Effect and Wave Theory of Light. Photon. Einstein's Photoelectric Equation: Energy Quantum of Radiation. Threshold frequency.

Pravalika
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Given that

Total energy of two rays 2E = 10.2 BeV

2E = 10.2 * 10^9 eV

2E = 10.2 * 10^9 * 1.6*10^{-10} J

Energy of ray E = \frac{10.2 * 10^9 * 1.6*10^{-10}}{2} J

E = 8.16 *10^{-10} J

Step 1: Finding the wavelength of y-rays

Energy of proton E=h\upsilon\ =\ \frac{hc}{\lambda}

Where, h - Planck's constant( 6.63*10^{-34} Js}), speed of light c = 3*10^{8} m/s   and \upsilon - frequency.

\lambda = \frac{h c}{ E }

\lambda = \frac{(6.63*10^{-34})*(3* 10^{8})}{8.16 *10^{-10}}

\lambda = 2.436 * 10^{-16} m

Therefore, wavelength of y-rays \lambda = 2.436 * 10^{-16} m