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" Two sinusoidal waves of equal frequency and each of same amplitude A, are n/2 radians out of phase. Determine the amplitude of the resultant wave when . they interfere. A. A2 B. 12A2 C. 4A2 D. [2 A2 ..._. .2 A diffraction-limited telescope with a 7.6-cm aperture is aimed at target 12.5 km away. Assuming light of 500 nm wavelength and neglecting air turbulence, determine the size of details can be resolved by the telescope. A. I 20 cm. B. 10 cm C. 5cm D. i 15cm