The electron antineutrino is which of the following types of particle?
A. meson
B. baryon
C. hadron
D. lepton
E. quark
D. lepton
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Which of the following types of cloud is found at the highest altitudes?
What will be an ideal response?
How can we best observe the Sun's chromosphere and corona?
A) The chromosphere is best observed with ultraviolet telescopes and the corona is best observed with X-ray telescopes. B) The chromosphere is best observed with infrared telescopes and the corona is best observed with ultraviolet telescopes. C) The chromosphere and corona are both best studied with visible light. D) The chromosphere and corona are both best studied with radio telescopes.
Parallax measurements of the distances to the nearest stars use ________ as a baseline.
A. Earth's orbit B. Earth-Moon distance C. Earth's diameter D. about the length of a football field
A certain crystal has an interatomic spacing of 0.142 nm. If a beam of electrons moving with a speed of 1400 m/s is diffracted from this crystal, what is the de Broglie wavelength of the electron?
A) 420 nm B) 130 nm C) 260 nm D) 502 nm E) 520 nm