14. Light of wavelength 750 (nm) passes through a single slit of width a. It creates a central diffraction peak that is 100 (cm) wide on a screen 25(cm) away. How wide is the single slit? That is, a = ? (A) 3.75×10⁻⁴ (mm) (B) 9.34×10⁻⁴ (mm) (C) 5.42×10⁻⁴ (mm) (D) 8.38×10⁻⁴ (mm)

10. The number of collisions a molecule makes per second is called collision frequency. At one atmosphere and 0 °C, estimate the collision frequency of air molecules. [The diameter of an air molecule under one atmosphere and 0 °C is approximately 3×10⁻¹⁰ (m), the average molecular speed is approximately 460 (m/s), and the molecular number density is approximately 2.7×10²⁵ molecules/m³]. (A) 3.5×10⁵ (collisions/s) (B) 3.5×10⁷ (collisions/s) (C) 3.5×10⁹ (collisions/s) (D) 3.5×10¹¹ (collisions/s)

14. Light of wavelength 750 (nm) passes through a single slit of width a. It creates a central diffraction peak that is 100 (cm) wide on a screen 25(cm) away. How wide is the single slit? That is, a = ?
(A) 3.75×10⁻⁴ (mm)
(B) 9.34×10⁻⁴ (mm)
(C) 5.42×10⁻⁴ (mm)
(D) 8.38×10⁻⁴ (mm)

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