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Longshore current brings about the transportation of sediments on the beach. Since waves usually approach the shore are an angle, the beach sand are carried up or down depending on the direction of the waves resulting in beach drift, that is, the net movement of the beach sand.
Answer: Instantaneous speed.
Explanation:
Answer: Gamma Ray
Supernova explosion is an event which occurs in the final stage of a star's life. Its a huge explosion and immensely bright which oushines a galaxy. The light from the supernova explosion cab be seen from billion of light years away. A supernova explosion releases gamma rays. Gamma rays are high frequency electromagnetic waves which carry large amount of energy. hence, a detector of gamma ray can be used to study a supernova explosion.