In addition to the conditions required for any solar eclipse what must also be true in order for you to observe a total solar eclipse?
The Moon's umbra must touch the area where you are located.
Earth must be near aphelion in its orbit of the Sun.
Earth must lie completely within the Moon's prenumbra.
Earth must lie completely within the Moon's umbra.
The Moon's umbra must touch the area where you are located.
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A device that measures absolute air pressure is called a
a. manometer. b. barometer. c. thermometer. d. tire gauge. e. none of the above
Identical waves superimposed out of phase produce a wave of decreased
A) amplitude. B) frequency. C) wavelength. D) all of the above E) none of the above
An electron inside a hydrogen atom is confined to within a space of about 0.12 nm
What is the uncertainty in this electron's speed? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 3.1 × 105 m/s B) 3.1 km/s C) 4.8 × 106 m/s D) 4.8 m/s E) 9.6 × 105 m/s
For an isotope with a half-life of one day, at the end of two days the amount that remains is
A) none. B) one-half. C) one-quarter. D) one-eighth. E) none of the above