Which travels at the greatest speed?

A.

sound through air

B.

light through glass

C.

sound through water

D.

light through a vacuum

Which of the following lists the Earth's layers in order from hottest to coldest in temperature? A. outer core, mantle, inner core, crust B. crust, mantle, outer core, inner core C. inner core, outer core, mantle, crust D.

Which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound waves? A. Vibrations have to be transmitted to the fibers of the auditory nerve. B.

Which type of wire would have the least resistance? A. thick, short, hot B. thick, long, hot C. thin, short, hot D. thin, long, cold E. thick, short, cold

Orion is visible on winter evenings but not summer evenings because of

Which of the following is an example of potential energy? Group of answer choices Water turning a turbine for electricity. Water in the clouds. Water falling to Earth as rain. Water evaporating into the atmosphere.

Why do we eat today

Which statement about ammeters and voltmeters is true? A. Current and voltage are the same throughout a circuit so where you place the ammeter and voltmeter doesn't matter. B.

Teens realize that things may be "shades of gray" after they enter Piaget's social stage. identity crisis stage. menarche stage. formal operational stage.

Technician A says that fractured rods have a unique mating surface and that only the cap that was fractured is the one that will fit that rod. Technician B says that a powdered metal rod is less expensive, lighter, and as strong as a forged rod.

What is the expected wavelength (in cm) of 10.5 ghz microwaves in free space?