The longest wavelength of visible light is _____
A) 400 nanometers
B) 500 nanometers
C) 700 nanometers
D) 900 nanometers
C
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Our Sun will likely die as a Type I supernova in about five billion years
Indicate whether the statement is true or false
Galileo's observations of a complete set of phases of Venus proved
a. that Venus orbited the sun. b. that Earth orbited the sun. c. that all of the planets orbited the sun. d. that the moon orbited Earth. e. that Venus had an atmosphere.
The frequency of a periodic wave is 340 Hz. The period of the vibration motion of the wave is
A. 2.56 milliseconds. B. 2.94 milliseconds. C. 3.55 milliseconds. D. 3.94 milliseconds. E. 4.25 milliseconds.
The Observable Universe: How does the age of the universe (estimated at 14 billion years) introduce the concept of the "observable universe?" Suppose you feel, as do many astronomers, that the universe is much larger than the observable universe
Do you think there is any way to obtain direct evidence for this larger universe?