Which of the following statements is true? 1. Mass is a concentrated energy and the two can be converted into each other. 2. The length of an object measured by an observer in a reference frame that is moving with respect to the object is more than its proper length. 3. The time interval between to events measured by a moving observer who views these events as occurring in different places is longer than the time interval measured by an observer at rest. 4. Light is said to be blueshifted when the source is moving towards the observer, thus, the wavelength appears to be shorter than when the source is at rest.

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