Trong thí nghiệm Y-âng về giao thoa ánh sáng : khoảng cách giữa hai khe là 0,5 mm ; khoảng cách từ mặt phẳng chứa hai khe đến màn quan sát là 1,5 m ; ánh sáng đơn sắc chiếu vào hai khe có bước sóng 0,6 μm.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above