Q1. Diffraction also occurs with sound waves. Consider 1900-Hz sound waves diffracted by a door that is 87 cm wide. What is the angle between the two first-order diffraction minima?
Q2. Two meteoroids are heading for earth. Their speed as they cross the moon's orbit is 2.3 km/s. The second meteoroid misses for earth by 2680 km. What is its speed at its closest point?