A Geiger counter registers a count rate of 4,800 counts per minute from a sample of a radioisotope. Sixteen minutes later, the count rate is 1,200 counts per minute. What is the half-life of the radioisotope?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?

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What is the largest meteoroid that has collided with this planet