State two uses of total internal reflection

How much current is in a circuit that includes a 9-volt battery with a resistance of 3

In a typical lightning strike, 2.0 c flows from cloud to ground in 0.24 ms. what is the current during the strike?

How many protons, neutrons, and electrons are in a neutral atom with the symbol 41Ca A) 20 protons, 21 neutrons, 21 electrons B) 20 protons, 21 neutrons, 20 electrons Eliminate C) 21 protons, 21 neutrons, 20 electrons D) 41 protons, 0 neutrons, 41

Which does not separate white light into the colors of the visible spectrum? A. rods in the retina of the human eye B. rain drops in the atmosphere C. a diamond ring D. cones in the retina of the human eye

What are the benefits of the cool-down period following exercise?

Sound with frequency 1300 Hz leaves a room through a doorway with a width of 1.03 m. At what minimum angle relative to the centerline perpendicular to the doorway will someone outside the room hear no sound

If wavelength is kept constant, which increases as the speed of a wave increases? Question 13 options: period frequency amplitude phase

If the masses of an object increase and their distance from each other stays the same the force of gravity decreases increases stays the same increases then decreases

Which are strong bases? Check all that apply. HCI NaOH NH3 H2CO3 ΠΗΝΟΣ OKOH

The universal force that is effective over the longest distance is called? A:electromagnetic B: strong nuclear C: weak nuclear D: gravity