Answer:
- Option <em>A), Planck.</em>
Explanation:
The first scientist to propose that an object could emit only certain amounts of energy was <em>Max Planck</em>.
Incandescent (very hot) objects emit different color of lights, i.e. different wavelengths, but by 1900 it was believed that the light (energy) was emitted in a continuous way.
Since the wave model did not explain the emission of such specific wavelengths, when the German physicist <em>Max Planck</em> (1858 - 1947) studied the light emitted by incandescent objects, he proposed that the objects (the matter) could gain or lose energy only in small specific amounts or packages of energy called quanta (plural of quantum).
Planck, later, established the mathematical relation between the energy of a quantum of light with the frequency of such the radiation (light emitted). This is the formula:
Where, E is the energy, h is Planck's constant, and ν is the frequency.
Answer:
different from the number of their neutrons
Explanation:
They each have one single proton (Z = 1), but differ in the number of their neutrons. Hydrogen has no neutron, deuterium has one, and tritium has two neutrons. ... Their nuclear symbols are therefore 1H, 2H, and 3H. The atoms of these isotopes have one electron to balance the charge of the one proton.
Answer:
A Calorimeter is a device used to measure the amount of heat involved in a chemical or physical process.
Explanation:
Ex- when an exothermic reaction ( accompanied by or requiring absorption of heat)occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution increasing its temperature.
- When an endothermic reaction (Heat evolving reaction) occurs, the heat required is absorbed from the thermal energy of the solution, decreasing its temperature.
A burning piece of coal which is releasing heat due to its combustion and is transferred to water.
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The answer is B since it's a second order reaction.
