The answer you're looking for is <u>D. Boiling points of various substances.</u> I got this answer because the independent variable is the thing in an experiment that is unaffected by any thing in the experiment, but has to be changed by the tester to find a change in the outcome of the dependent variable. It can't be A because depending on the temperature of the heated container must be different to reach the boiling point of different substances, for this reason, we also find out that D is the answer. I hope that this helps!
As an object is heated up, its atoms and molecules move and collide faster. Geothermal energy is the thermal energy in the earth. Wind. ... total kinetic energy of the particles hat make up a substance.
The formula of De Broglie is the following:
Remember that the mass of an electron is 9.11 x 10 ^(-31) kg, so replacing in the formula, we're going to obtain:
The answer is that the wavelength of an electron traveling at 1.48 x 10^(5) m/s is 4.91 x 10^(-9) m.
Solar energy will not run out (unless the sun burns out), but the supply of fossil fuels we use is slowly depleting. Burning fossil fuel also releases greenhouse gas into the air, which is bad for the atmosphere.