Which of the following procedures was done to minimize human error? We let the weight swing 25 times and divided by 25 to get the avg period of one oscillation Why did we plot T2 vs L instead of just T vs L? By squaring the entire equation, we make T2 linear with L. Suppose Sarah Smith is swinging on a swing at the park. If the chain is 3 meters long, what will be the period (time) of one swing? 3.47 seconds 4.2 seconds 2.8 seconds Should the period depend on the mass at the end of the string?

T = 3.475 s

Time period is independent from mass

Explanation:

- To reduce the human error in taking any measurements we take multiple N number of readings. Then sum up all the readings and divide by N to find an average. The error between each individual reading and the actual reading is reduced by repetition.

- We use the plot of T^2 against L to form a linear relationship between two variables. We square the entire the equation for linearize the equation.

- Given, L = 3 m . The time period is approximated by a pendulum expression given as:

                                     T = 2*pi*sqrt ( L / g )

Where, g is the gravitational acceleration 9.81 m/s^2

- Then we have:

                                     T = 2*pi*sqrt ( 3 / 9.81 )

                                     T = 3.475 s

- From above expression we see that time period is independent from the mass at the end of the string but a function of pendulum geometry and kinetics.  

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

false

explanation: