What property of a wave remains unchanged when a wave enters a different medium?

A metal ball of specific heat capacity 400 joule per kgper celsius is allowed to fall from a height of 100 metre.

You are given a number of 12 Ω resistors, each capable of dissipating only 2.6 W without being destroyed.

An instrument that can detect the presence of an electric charge is a a. magnet. b. electroscope. c. generator. d. conductor.

When you stack three flashlight batteries in the same direction, you get a voltage of 3*1.5 volts = 4.5 volts. What voltage do you get if one of the batteries is turned to face in the opposite direction? a) 0 volts b) 1.5 volts c) 3 volts d) - 4.

Which of the following would act as a barrier to sound waves?

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.

Why does each mineral have their own property, different from every other mineral?

Earth's tallest mountain ranges are found at plate boundaries