Which statements are correct about becquerel (bq) and gray (gy) units? check all that apply. gray units measure the number of disintegration’s of radioactive atoms over a period of time gray units measure the radiation dose absorbed by any material becquerel units measure the radiation dose absorbed by biological tissue becquerel units measure emitted radiation gray units measure radiation dose gray units measure biological risk

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.