All wavelengths of light travel at the same speed in a vacuum, and carry the same energy per photon
Indicate whether the statement is true or false
FALSE
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The tails streaming from a comet's coma are caused by
A. radiation pressure and the particle wind from the Sun pushing them out. B. explosive forces from the hot nucleus ejecting the gas. C. the comet leaving the material behind it as it travels forward. D. the comet's magnetic field channeling and ejecting the particles of the tail.
Distinguish between fluorescence and phosphorescence
The NGC (New General Catalog) is a compilation started by Herschel, and lists galaxies and other astronomical objects.
Answer the following statement true (T) or false (F)
Calculate the average force a bumper would have to exert to bring a 1200-kg car to rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph)
A) 1.8 × 104 N B) 1.6 × 104 N C) 5.4 × 104 N D) 6.5 × 105 N E) 3.2 × 104 N