During the National Day in 2013, Xiao Ming and his father traveled to Beijing together. They took the K52 train from Surabaya Railway Station to Beijing. The train timetable is as follows

(1) Taking the train as the reference object, the distance between the lighthouses on both sides and the train is constantly increasing, that is, the lighthouses on both sides are moving backward, so the train is chosen as the reference object;

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(2) The traveling time of K52 train from Surabaya to Beijing is t=24:-20:08+5:20=9h12min=9.2h,

Distance s=967km-262km= 705km,

The average speed of the train: v=st=705km9.2h=76.6km/h;

(3) Echo Wall, Three-tone Stone, and Circular Mound in the Temple of Heaven in Beijing There are very beautiful sound phenomena in the three buildings. It is an acoustic effect caused by ancient Chinese architects using multiple reflections of sound to make the sound louder.

(4) The color of an opaque object is determined by the color light reflected by the object. The reason why the chrysanthemum appears yellow is because it only reflects yellow light, and other colors of light are absorbed.

So the answer is: (1) Train;

(2) The average speed of K52 train from Surabaya to Beijing is 76.6km/h;

( 3) Reflection; loudness;

(4) Chrysanthemums only reflect yellow light, and other colors of light are absorbed.