The number of electrons in an atom of an element is the same as the element's
a. atomic number.
b. period number.
c. mass number.
d. group number.
a
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A speedy tortoise can run with a velocity of 10.0 cm/s and a hare can run 20.0 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.00 minutes. The tortoise wins by a shell (20.0 cm). What was the length of the race?
What will be an ideal response?
What does "maria" mean?
a. plateaus b. ponds c. rivers d. rivers e. seas
In a single-slit diffraction experiment, the angular width of the central maximum is 0.16°. The width of the slit is then doubled as is the distance to the screen. What is the resulting angular width of the central maximum?
a. 0.64° c. 0.32° b. 0.080° d. 0.16°
In this photo, water drops produce disturbances that move outward in circular patterns. What moves outward as drops hit the water's surface? (Hint: If a cork were floating on the water's surface, what would be its motion?)
a. The water at the surface. b. The energy of neighboring water molecules. c. Both a. and b.