The shorter the wavelength of light, the higher its frequency.
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If the ground were not “in the way,” rainbows would appear a…
If the ground were not “in the way,” rainbows would appear as whole circles.
If your mass is 60 kg on Earth, what would your mass be on t…
If your mass is 60 kg on Earth, what would your mass be on the Moon?
Which of the following is largest?
Which of the following is largest?
What do we mean by the observable universe?
What do we mean by the observable universe?
Which of the following elements will most likely form an ion…
Which of the following elements will most likely form an ion with a +2 charge?
The age of the universe is
The age of the universe is
One light-hour is the distance that light travels in an hour…
One light-hour is the distance that light travels in an hour. How far is this, in kilometers? (Recall that the speed of light is 300,000 km/s.)
Which of the following is the correct electron dot structure…
Which of the following is the correct electron dot structure for chlorine (atomic no. = 17)?
No galaxies existed before the Big Bang.
No galaxies existed before the Big Bang.