# Relationship between light intensity and distance equation acceleration

### Relationship Between the Distance and Time of a Falling Object | Science project | gtfd.info Measuring light intensity as a function of distance from the source. 5) How does the equation for this relationship compare with those of other equations you. The intensity or brightness of light as a function of the distance from the light source follows an inverse square relationship. Suppose you were to use a light. The intensity of a sound wave is a combination of its rate and density of energy transfer. the wave is traveling and whose length is the distance the wave travels. . We now have an equation that relates intensity (I) to acceleration amplitude (∆a). . We get this thing again — the intensity-pressure amplitude relationship.

Calculate the acceleration at any point on the graph.

### Inverse Square Law

How close is it to the gravitational acceleration of Earth? Repeat the experiment with a dollar bill. Use the above equation to calculate how long it will take for the length of the dollar to pass through your fingers.

Can you catch it? Results Graphing results will show that distance traveled is in proportional to the square of the time spent falling. Your calculated acceleration should be close to 9. Human reaction time is approximately 0. The graph you create will show that the longer the meter stick falls, the faster it ends up moving. This explains the curve in the graph: The gravitational attraction force between two point masses is directly proportional to the product of their masses and inversely proportional to the square of their separation distance.

The force is always attractive and acts along the line joining them. If the distribution of matter in each body is spherically symmetric, then the objects can be treated as point masses without approximation, as shown in the shell theorem.

Otherwise, if we want to calculate the attraction between massive bodies, we need to add all the point-point attraction forces vectorially and the net attraction might not be exact inverse square. However, if the separation between the massive bodies is much larger compared to their sizes, then to a good approximation, it is reasonable to treat the masses as a point mass located at the object's center of mass while calculating the gravitational force.

## Inverse Square Law, General

As the law of gravitation, this law was suggested in by Ismael Bullialdus. Indeed, Bullialdus maintained the sun's force was attractive at aphelion and repulsive at perihelion. Hooke's Gresham lecture explained that gravitation applied to "all celestiall bodys" and added the principles that the gravitating power decreases with distance and that in the absence of any such power bodies move in straight lines.

Pressure fluctuations caused by sound waves are much easier to measure.

### Inverse-square law - Wikipedia

Animals including humans have been doing it for several hundred million years with devices called ears. Humans have also been doing it electromechanically for about a hundred years with devices called microphones. All types of amplitudes are equally valid for describing sound waves mathematically, but pressure amplitudes are the one we humans have the closest connection to.

In any case, the results of such measurements are rarely ever reported. Instead, amplitude measurements are almost always used as the raw data in some computation. When done by an electronic circuit like the circuits in a telephone that connect to a microphone the resulting value is called intensity. When done by a neuronal circuit like the circuits in your brain that connect to your ears the resulting sensation is called loudness.

The intensity of a sound wave is a combination of its rate and density of energy transfer. It is an objective quantity associated with a wave. 