Trong mẫu chứa 1.49 μg khí 13 7N với chu kỳ bán rã t1/2 = 600 s. Hãy xác

định : số lượng hạt nhân 13

7N trong mẫu; hoạt độ phóng xạ của mẫu; hoạt độ

phóng xạ của mẫu sau 1 giờ.

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

Drag the tiles to the correct boxes to complete the pairs. match the jobs with the education requirements. childcare director clinical psychologist concierge cosmetologist vocational school and state licensure arrowright on-the-job training arrowright a ph.d. with licensure or certification, depending on the state in which you live arrowright a bachelor’s degree in early childhood development arrowright

There are 3 ways heat can be transferred: through solids, called , through liquids and gases , called , and through electromagnetic waves, called