It is desired to use an electron microscope to study features in a virus that are about 0.25 nm. What accelerating voltage is needed for the electrons used in this microscope?
A. 96 V
B. 48 V
C. 24 V
D. 5 V
C. 24 V
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Gas and dust released by a comet's icy nucleus produce a(n) _______________ and are then blown outward, away from the Sun
Fill in the blank(s) with correct word
What is the key distinction between protostars and true (main-sequence) stars?
A) Protostars generate most of their energy from gravitational contraction, and stars generate it from nuclear fusion. B) Protostars are larger and more luminous than stars. C) Protostars have stronger magnetic fields than stars. D) Protostars are supported by thermal pressure, and stars are supported by degeneracy pressure.
What is erupting out of the geysers on Triton?
A) liquid water with basalt B) liquid methane with a dark hydrocarbon slush C) liquid nitrogen with carbon grit D) liquid carbon dioxide with graphite E) liquid hydrogen with dark helium ash
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct? (There could be more than one correct choice.)
A) The truck experiences the greater magnitude momentum change. B) The small car experiences the greater magnitude momentum change. C) The small car and the truck experience the same magnitude momentum change. D) The magnitude of the momentum change experienced by each one is inversely proportional to its mass. E) The magnitude of the momentum change experienced by each one is directly proportional to its mass.