Which of the following statements is NOT true? 1)The average magnitude of the Poynting vector is the intensity of a wave 2)Momentum per unit time per unit area carried by an EM wave is called radiation pressure 3)The speed of light in a vacuum is constant 4)EM waves with very large wavelengths are called gamma rays

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?