Adevice used to indicate the presence of static electricity is called a(n)
-electroscope
-van de graaff generator
-electromagnet
-galvanometer

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o