Physics Dual Nature of Radiation and Matter 1 Mark Appeared in: 2025 (3 sets) (iii) When the wavelength of a photon is doubled, how many times its wave number and frequency become, respectively ? (A) $2, \frac{1}{2}$ (B) $\frac{1}{2}, \frac{1}{2}$ (C) $\frac{1}{2}, 2$ (D) $2, 2$