A scientist named ______________ discovered radioactivity in 1896
Fill in the blank(s) with correct word
Henri Becquerel
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A ______________ is an array of electromagnetic radiation and a ___________ is an instrument that spreads light according to color
a. prism, mirror b. lens, grating c. rainbow, prism d. spectrum, spectrograph
At a rock concert, if the speakers are placed on the floor instead of higher up on a tower, state if the intensity of the sound you would hear, from the same distance away, is the same or different and why
What will be an ideal response?
The huge, dark, almost spherical regions between the superclusters of galaxies are called ________
Fill in the blank(s) with correct word
Which chemical elements were created during the first few minutes of the "big bang" that started our universe?
A) All 92 of the naturally-occurring chemical elements. B) Only the elements through iron in the periodic table, i.e., only elements 1 through 26. C) Only the first three elements: hydrogen, helium, and lithium. D) Only the heaviest elements, having atomic numbers higher than that of lead. E) No elements were produced during the big bang--all the normal chemical elements were produced much later.