Physics Fundamentals ( Phys1001 )

Empirical formulas represent the ratio of atoms in a formula. It is expressed in the simplest, small, whole number ratio. The molecular formula can either be the empirical formula, or a multiple of the empirical

1. Find the westward component of a resultant vector 85.42 unit, 23º W of N.

the chemical energy stored in batteries gets transformed into electrical energy through the wires, then gets transformed into light energy and thermal energy that you see.

There is a very easy way to find the empirical formula of a compound using the mass percentages found through elemental analysis. First, convert the mass percentages to a mass, assuming that the compound is 100g. Then convert each mass into moles using the molar masses. Then divide each of these moles by the element with the smallest amount of moles. That is the ratio of the empirical formula. Just make sure that the numbers are in whole numbers, if not, multiply by common denominators to get all of them to a whole number (3).

In this experiment, the signal generator was set so that the frequency meter showed a reading of 1,803 Hz. The microphone was moved to a distance from the speaker so that the oscilloscope displayed a straight diagonal line. This position was of the microphone was recorded as the initial position, or beginning of a wavelength. The microphone was then moved farther in the same direction until the oscilloscope displays the same horizontal line. This position was recorded as final position, or the end of the wavelength. The distance between the two positions represents one wavelength for this frequency. This was repeated for frequencies of 2,402 Hz, 3,002, Hz, 3,602 Hz, and 4,201 Hz.

We can determine an object’s temperature from its thermal (or “blackbody”) spectrum by finding the wavelength at which it emits the most electromagnetic radiation.

The atom of an element has electrons that are found around the nucleus in regions known as orbitals. When energy is absorbed by the electrons of an atom they begin to jump to higher energy levels. When this happens the electrons are in an excited state. However when the electrons begin to release the energy and drop in energy levels they emit electromagnetic radiation. If the radiation that is emitted falls between 400 to 700 nanometers then the electrons emit photons which we can see as visible light.

Batteries store energy in chemical form. They release energy by pumping electrons’ through wires from the minus pole to the plus pole. Devices inbetween convert this energy to another form, Efficieny- e.motor=85%, combustion= 20%

14. Different levels of brightness are due to different levels of heat, and different distances.

20. Because the magnetic force which deflects the electrons is defined by F = q * v x B

A car in a roller coaster moves along a track that consists of a sequence of ups and downs. Let the x

In this activity, the marbles represent the narrow beam of alpha particles used to determine the structure of atoms, the unknown object represents the atoms that Rutherford studied, the cardboard represents the gold foil that was made up of gold atoms and the paper represents the approximate path that the alpha particles bounced off of or went through the gold foil at that Rutherford observed.

In the study of the spectral range of 400-200 nm devices are used built on the same optical scheme as those for studying the visible range of the spectrum, the difference is only in the glass prisms, lenses, and other optical components. When measuring the intensity of UV emission, as a reference is used source in the UV region of the spectrum with known distribution of the spectral brightness (band tungsten lamp, coal arc, and synchrotron radiation). A thermocouple and graded solar cells are standard receivers in this region of the spectrum. Continue reading →

Task Description:The world communicates by making extensive use of the electromagnetic spectrum. For the average person this is commonly accessed using radio waves. These radio waves may be over the AM or FM radio wave bands or the radio waves that transmit our television signals. Not only are people always within a ‘phone call of each other anywhere in the world they are also able to find out exactly where in the world they are by use of

3 because this is the maximum absorbance for the iron (III) ion. The Beer's Law Plot that was graphed came out to be linear with an equation of: