The element barium should produce compounds most similar to those of
a. sodium.
b. nitrogen.
c. carbon.
d. calcium.
d
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Astronomy's largest optical telescopes are ________.
A. refractors B. diffractors C. deflectors D. reflectors
At what minimum rate is a 60.0-kg boy converting his internal energy when, in 8.00 s, he runs up a flight of stairs that is 10.0-m high?
A) 75.0 W B) 735 W C) 4.80 kW D) 48.0 W
Index of Refraction: Light having a speed in vacuum of 3.0 × 108 m/s enters a liquid of refractive index 2.0. In this liquid, its speed will be
A. 6.0 × 108 m/s. B. 3.0 × 108 m/s. C. 1.5 × 108 m/s. D. 0.75 × 108 m/s. E. 0.67 × 108 m/s.
Which of the following is true of the light emitted by the big bang gases?
A) It is detectable with infrared telescopes. B) It can no longer be used to detect the big bang. C) It is not detectable with radio telescopes. D) It can be seen with the unaided eye.