Telescopes being planned for the study of the earliest stages in galactic lives will be optimized for observations in
A) visible light.
B) infrared light.
C) radio waves.
D) X-rays.
B
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Electrons emerge from an electron gun with a speed of 2.0 × 106 m/s and then pass through a pair of thin parallel slits
Interference fringes with a spacing of 2.7 mm are detected on a screen far from the double slit and fairly close to the center of the pattern. What would the fringe spacing be if the electrons were replaced by neutrons with the same speed? (mel = 9.11 × 10-31 kg, mneutron = 1.67 × 10-27 kg) A) 1.5 nm B) 1.5 µm C) 4.9 µm D) 1.1 µm E) 0.93 nm
In the four radioactive series, the nuclei decay by either emitting alpha particles or beta particles until they reach the stable end product. Each decay, therefore, results in a mass number change of either 4 (for alpha decay) or 0 (for beta decay). The radium isotope 226Ra is in one of these series. What is the starting isotope in the series containing 226Ra?
a. 238U c. 232Th b. 235U d. 237Np
Is the actual size of the universe larger than 14 billion light years?
A) The observable universe is 14 billion light years in each direction, so the actual universe is greater than 14 billion light years across. B) We do not have enough information to know this. C) The universe must be exactly equal in size to its age, so it must not be larger than 14 billion light years across in size. D) It is only 14 billion light years across to us; to an observer 10 billion light years away, it is smaller.
A spherical, non-conducting shell of inner radius r1= 10 cm and outer radius r2 = 15 cm carries a total charge Q = 15 ?C distributed uniformly throughout the volume of the shell
What is the magnitude of the electric field at a distance r = 12 cm from the center of the shell? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 5.75 × 103 N/C B) zero C) 2.87 × 106 N/C D) 5.75 × 106 N/C E) 2.87 × 103 N/C