Physical Science - 02.05 - Question #3

There is a new brand of water on the market advertised to relieve headaches. It is selling like crazy! When the Food and Drug Administration asked for scientific proof that the water actually does what it claims to do, the owners of the company produced a scientific research study that they had paid a group of scientists to perform. In the study, researchers gave this special water to a group of 50 people who claimed to have a headache. The people drank the special water whenever they felt thirsty over a period of 24 hours. After the 24 hours, 99% of the people reported that their headache was gone.

Should the Food and Drug Administration trust this scientific study and allow the company to sell the water with this claim? Would this be an example of science or pseudoscience? Support your answer with at least three reasons.

1. They should not trust this study. 2. Pseudoscience.

Explanation:

Because they drank the water and after 24 hours, they said that it was gone. Head aches go away sooner than that. Another reason is that some people could have lied about having a headache just so they could have the water or their headache could have gone away before they drank the water.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

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.