In science, words always
a. have the same meaning as common English words.
b. mean very vague things, so scientists can hide their ignorance.
c. have no reason for being; they must just be memorized.
d. are used faddishly by scientists and the public.
e. have specific meanings shared worldwide by all scientists.
E
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Matter Waves: A crystal diffracts a beam of electrons, like a diffraction grating, as they hit it perpendicular to its surface. The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface. (e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s)(a) What is the wavelength of the electrons?(b) What potential difference accelerated the electrons if they started from rest?
Fill in the blank(s) with the appropriate word(s).
Sunlight takes about 8.4 minutes to travel from the Sun to Earth. When NASA's New Horizons Spacecraft passed Pluto in 2015, it was about 32 AU from Earth. About how long did it take for transmitted images of Pluto to travel from the spacecraft to Earth?
A) one Plutonian year B) 4-1/2 hours C) 2-1/4 days D) 3 weeks E) They arrived almost instantaneously.
If Earth's mass decreased to one-half its original mass with no change in radius, your weight would
A) decrease to one-quarter. B) decrease to one-half. C) remain the same. D) none of the above
Hot steam that issues from a pressure cooker expands and
A) increases in temperature. B) can cause severe burns. C) cools. D) all of the above E) none of the above