Category: Physics

How is a specimen prepared for a transmission electron microscope? For TEM, samples must be cut into very thin cross-sections. This is to allow electrons to pass right through the sample. After being fixed and dehydrated, samples are embedded in hard resin to make them easier to cut. How do you prepare a specimen for […]

What will increase the speed of sound in air? Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second. The speed of sound is also affected by other factors […]

What is the time period of simple pendulum? A mass m suspended by a wire of length L is a simple pendulum and undergoes simple harmonic motion for amplitudes less than about 15º. The period of a simple pendulum is T=2π√Lg T = 2 π L g , where L is the length of the […]

Why does entropy decrease? The entropy is decreasing because a gas is becoming a liquid. The entropy is increasing because a gas is being produced and the number of molecules is increasing. The entropy is decreasing because four total reactant molecules are forming two total product molecules. All are gases. Why does boiling water using […]

What is the discriminant of 3x 2 10x =- 2? The discriminant of is 76. What number should be added to the expression x2 6x to change it into a perfect square trinomial? 9 Is x2 10x 25 a perfect square trinomial? 1 Answer. Yes, x2+10x+25 is a perfect square trinomial. Which value must be […]

Does oxygen or nitrogen have more kinetic energy? Since, oxygen and nitrogen are both diatomic, the average kinetic energy of an oxygen molecule is the same as the average kinetic energy of a nitrogen molecule. Thus 20% of the kinetic energy is in the oxygen. What gas has the highest kinetic energy? helium Which sample […]

In what way is potential energy related to gravity? Since the gravitational potential energy of an object is directly proportional to its height above the zero position, a doubling of the height will result in a doubling of the gravitational potential energy. A tripling of the height will result in a tripling of the gravitational […]

How much force is a joule? 1 joule of work = 1 N of force x 1 m of distance In the English system of units, where force is measured in pounds, work is measured in a unit called the foot-pound (usually abbreviated ft-lb). How much energy is 1kj? Thus, a kiloJoule (kJ) is 1000 […]

Is the ozone healing 2020? An “unprecedented” ozone depletion in the northern hemisphere has healed, but unlikely due to the impacts of worldwide coronavirus lockdowns, scientists say. It’s now back to normal again the ozone hole has closed,” she said. Will ozone layer repair itself? The ozone layer surrounding the earth helps in absorbing harmful […]

Which is the correct definition of electronegativity? Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves. Its symbol is the Greek letter chi: χ The higher the electronegativity, the greater an atom’s attraction for electrons. What does electronegativity do to polarity? Electrons in a polar covalent bond are shifted toward the […]