If the scalar (dot) product of two vectors is negative, it means that

a.
there was a calculator error.

b.
the angle between the vectors is less than 90 degrees.

c.
the angle between the vectors is 90 degrees.

d.
the angle between the vectors is greater than 270 degrees.

e.
the angle between the vectors is between 90 and 180 degrees.

e

Physics & Space Science

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Which of the following statements is correct about the experiment that first measured the charge of the electron?

A. The oil drop is suspended because there are no forces acting on the drop B. The important result was that Coulomb attraction made all of the oil drops the same mass, regardless of type of oil C. The mass of the drop was determined by measuring its terminal velocity D. The value for electron charge had an experimental error of about 35% E. Light hitting the oil drops manipulated their movement in a way to create an interference pattern.

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Where did the molecular oxygen in Earth's atmosphere come from?

A) photosynthesis by living organisms B) the breakdown of water molecules by sunlight C) outgassing from volcanoes D) evaporation from the oceans E) chemical reactions with surface rocks

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________ range in wavelength from millimeters to hundreds of meters.

A. Ultraviolet waves B. Gamma rays C. Visible light waves D. X-rays E. Radio waves

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You and I are emitting primarily

A) X-ray radiation. B) infrared radiation. C) visual radiation. D) radio radiation.

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