X-ray
are the part of electromagnetic
spectrum and are chalacterized by
frequencies higher than those of:
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The distance moved by an object in a unit time is called its speed. The speed of an object is the distance travelled divided by the time taken to cover that distance. Its basic unit is metre per second (m/s). The motion of objects can be presented in pictorial form by their distance-time graphs. Periodic events are used for the measurement of time. The periodic motion of a pendulum has been used to make clocks and watches. The distance-time graph for the motion of an object moving with a constant speed in a straight line. Graph of distance and time for the motion of an object with constant speed will be a straight line
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