Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Q: The height of a wave is its amplitude. Another measure of wave size is wavelength. Both wave amplitude and wave- length are described in detail below. Figure 19.11 shows these wave measures for both transverse and longitudinal waves. You can also simulate waves with different amplitudes and wavelengths by doing the interactive animation at this URL: [Link] . Wave amplitude is the maximum distance the particles of a medium move from their resting position when a wave passes through. The resting position is where the particles would be in the absence of a wave. In a transverse wave, wave amplitude is the height of each crest above the resting position. The higher the crests are, the greater the amplitude. In a longitudinal wave, amplitude is a measure of how compressed particles of the medium become when the wave passes through. The closer together the particles are, the greater the amplitude. What determines a waves amplitude? It depends on the energy of the disturbance that causes the wave. A wave caused by a disturbance with more energy has greater amplitude. Imagine dropping a small pebble into a pond of still water. Tiny ripples will move out from the disturbance in concentric circles, like those in Figure 19.1. The ripples are low-amplitude waves. Now imagine throwing a big boulder into the pond. Very large waves will be generated by the disturbance. These waves are high-amplitude waves. Another important measure of wave size is wavelength. Wavelength is the distance between two corresponding points on adjacent waves (see Figure 19.11). Wavelength can be measured as the distance between two adjacent crests of a transverse wave or two adjacent compressions of a longitudinal wave. It is usually measured in meters. Wavelength is related to the energy of a wave. Short-wavelength waves have more energy than long-wavelength waves of the same amplitude. You can see examples of waves with shorter and longer wavelengths in Figure 19.12. Imagine making transverse waves in a rope, like the waves in Figure 19.2. You tie one end of the rope to a doorknob or other fixed point and move the other end up and down with your hand. You can move the rope up and down slowly or quickly. How quickly you move the rope determines the frequency of the waves. The number of waves that pass a fixed point in a given amount of time is wave frequency. Wave frequency can be measured by counting the number of crests or compressions that pass the point in 1 second or other time period. The higher the number is, the greater is the frequency of the wave. The SI unit for wave frequency is the hertz (Hz), where 1 hertz equals 1 wave passing a fixed point in 1 second. Figure 19.13 shows high-frequency and low- frequency transverse waves. You can simulate transverse waves with different frequencies at this URL: [Link] The frequency of a wave is the same as the frequency of the vibrations that caused the wave. For example, to generate a higher-frequency wave in a rope, you must move the rope up and down more quickly. This takes more energy, so a higher-frequency wave has more energy than a lower-frequency wave with the same amplitude. Assume that you move one end of a rope up and down just once. How long will take the wave to travel down the rope to the other end? This depends on the speed of the wave. Wave speed is how far the wave travels in a given amount of time, such as how many meters it travels per second. Wave speed is not the same thing as wave frequency, but it is related to frequency and also to wavelength. This equation shows how the three factors are related: Speed = Wavelength Frequency In this equation, wavelength is measured in meters and frequency is measured in hertz, or number of waves per second. Therefore, wave speed is given in meters per second. The equation for wave speed can be used to calculate the speed of a wave when both wavelength and wave frequency are known. Consider an ocean wave with a wavelength of 3 meters and a frequency of 1 hertz. The speed of the wave is: Speed = 3

A: SI unit for wave frequency
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Q: Alexey Suetin was married to Woman Grandmaster Kira Zvorykina and together they had a son Aleksandr, born 1951.

A: What is Alexey Suetin's spouse's name?
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Q: Doug (Barry Sullivan) and Helen Stilwin (Barbara Stanwyck) head off for a fishing vacation with their son Bobby (Lee Aker). Doug wants to return to beach he visited years before. The family is towing a small trailer with camping gear so they can fish and camp on the isolated beach south of Escondido in Mexico.As they leave drive, they get farther away from towns, services, and civilizations. When they need water for the cars radiator, they can only find a deserted service station. They leave the main road and encounter a police block. After a quick scan of the car, the Mexican authorities let them proceed, with no explanation for why they were stopped. When Helen asks Doug why he didn't push for an explanation, he tells her he didn't want them to look too closely at the car. He didn't want to explain why he was carrying his army pistol. Helen puts the gun in the glove box and they proceed.When they arrive at the beach, it is indeed isolated. An old, rotting jetty emerges far out into the water. As Doug and Helen are getting settled in and relaxing, Bobby climbs out to the jetty's end. Helen is worried the jetty is not safe and frantically calls Bobby back. As he return, his foot slips and is caught between two planks. Doug goes out to free him. As they are walking back over the precarious timbers, a large wave combined with Doug's weight causes the jetty to fall. Doug is trapped on the beach, his foot stuck under a timber too large to move.Helen tries to dig Doug out with a shovel, but the beach is solid rock. She retrieves the car jack and nearly has the large timber raised when the pin in the jack breaks. Doug and Helen decide that with a sturdy rope, she can pull the timber with the car. Helen will have to drive back to the deserted service station to find a rope. They estimate that Helen should have four hours before the rising tide covers Doug completely, threatening to drown him. Bobby stays with Doug and makes him a cup of coffee. Bobby tries unsuccessfully to wave down a fishing boat. When all hope is nearly gone, Doug and Bobby have a serious father and son talk about what should happen if Helen does not return in time.Helen races down the road. When she encounters a Mexican family, she pleads for help or a rope, but they do not understand her poor attempt at Spanish until she is gone. She reaches the service station and breaks into the building and retrieves a rope. As she returns to the car, she is relieved to see Lawson (Ralph Meeker), an American man, suddenly standing by her car. She quickly enlists his help and they head for the beach to save her husband. As they pull away with Lawson in the drivers seat, the camera shows a dead man lying in the bushes.Lawson soon reveals that he has no intention of helping her husband. He is running from the police. He finds the gun in the glove compartment and holds the gun on her while they pass the police. While he is speeding down the rough roads, they have a flat tire. Lawson is unable to find the jack, but manages to drive the car up onto a ramp made of abandoned boards. After he changes the tire, Helen tries to hit him with a tire iron, but he is able to fight her off. He escapes capture again, but this time has to fire the gun at a police car pursuing him. Realizing that she cannot overpower Lawson, Helen begins to bargain with him. Helen promises Lawson her husband's clothes, his identification card, and the car if only Lawson will help free her husband. Finally, she offers him what he really wants: she will go with him after they free his husband. Traveling as couple and with her husband's identification, they will more easily get by the police. She will do anything to save her husband's life.Once they arrive at the beach, the situation is dire. The rising tide

A:
What does Lawson latch the falling pine to?
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