Trong thí nghiệm y âng về giao thoa ánh sáng Biết D=2m a=2mm hai khe được chiếu bằng ánh sáng trắng có bước sóng từ 0,4m đến 0,75m tại điểm trên màn quan sát cách vân trắng chính giữa 3,3mm số bức xạ cho vân sáng tại đó là: A.4
B.3
C.5
D.6

Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.