The number of times that a wave vibrates in a unit of time is called

A. amplitude

B. frequency

C. wavelength

D. interference ... ?

Which of the following best describes magnetic fields? A. Magnetic fields need a conductor. B. Magnetic fields are always found in insulators. C. Magnetic fields have north and south magnetic poles. D. Magnetic fields must have only positive charges.

Which term best describes all atoms in ionic bonds?

Magnet a has twice the magnetic field strength of magnet b, and at a certain distance it pulls on magnet b with a force of 50n. with how much force, then, does magnet b pull on magnet a?

An astronaut is on a new planet. She discovers that is she drops a space rock from 12m above the groundnut has a final velocity of 3m/s just before it strikes the planet surface. What is the acceleration due to gravity on the planet?

A negative charge is placed inside the cavity of a hollow metal solid. The outside of the solid is grounded by connecting a conducting wire between it and the earth.

Work is a product of A force and distance B force and heat energy C cause and heat energy D cause and effect

An exploration submarine should be able to descend 1200 m down in the ocean. If the ocean density is 1020 kg/m3, what is the maximum pressure on the submarine hull?

Why cooking pans don't have have metal handles?

Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band

How would you explain photosynthesis to a new student in class