Emission nebulae like M42 occur only near stars that emit large amounts of:
A) visible light.
B) microwaves.
C) ultraviolet radiation.
D) infrared heat.
E) X-rays and gamma rays.
C
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Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, we breathe in at least one of them each
A) single breath. B) day. C) month. D) ten years. E) can't say for some people breathe a few of Caesar's atoms daily, while others never.
A 320-kg satellite experiences a gravitational force of 800 N. What is the radius of the satellite's orbit? (Earth's radius is 6,400 km.)
A. 6,400 km B. 12,800 km C. 19,200 km D. 25,600 km
The Jurassic period is part of the ______________ era
Fill in the blank(s) with correct word
A gold ring has an inner diameter of 2.168 cm at a temperature of 15.0°C. Determine its diameter at 100.0°C. (aGOLD = 1.42 × 10^-5/°C)