AP EAMCET2008PhysicsElectromagnetic Waves
X-rays of wavelength 0.140 ~nm are scattered from a block of carbon. What will be the wavelengths of X -rays scattered at 90^ ?
Options
- A0.140 ~nm
- B0.142 ~nm
- C0.144 ~nm
- D0.146 ~nm
Correct answer
B. 0.142 ~nm
Step-by-step solution
For =90^ , =0 So, aligned & ^ = + h m_e c & =0.140 10⁻⁹+ 6.63 10⁻³⁴ (9.1 10⁻³¹ ) (3 10^8 ) & = (0.140 10⁻⁹+2.4 10⁻¹² ) m & =0.142 ~nm aligned