Anemometer beam exits reflect, or backscatter, the light back into a detector, where it is measured relative to the original laser beam. When the particles are in great motion, they produce a Doppler shift for measuring wind speed in the laser light, which is used to calculate the speed of the particles, and therefore the air around the anemometer. Ultrasonic anemometers, first developed in the 1950s, use ultrasonic sound waves to measure wind velocity. They measure wind speed based on the time of flight of sonic pulses between pairs of transducers. Measurements from pairs of transducers can be combined to yield
What Kate Does had hidden and later talks with Kate at Dharma's dock. He explains that he planned to propose to Juliet and that he blames himself for her death, saying that he convinced her to stay on the island with him because he was lonely. Meanwhile, Jin is caught by the Others, who want to kill him instead of taking him back. Suddenly, someone shoots them and Jin is shocked to see that the shooter is Claire. The episode has received mixed reviews. Critical review aggregate website Metacritic awarded "What Kate Does" a score of 64 out of 100, indicating "generally favorable