Cho mạch điện r1 //r2//r3 Cho biết r1 =12 ôm , r2=18ôm ,r3=20ôm a) Tính điện trở tương đương của đoạn mạch b) tính cường độ dòng điện qua từng điện trở

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

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

The junction rule describes the conservation of which quantity? note that this rule applies only to circuits that are in a steady state.