Answer:
Isotopes
Answer:
The number of neutrons can vary, but not protons. This is called an isotope. An example is deuterium, an isotope of hydrogen with an extra neutron, but the same number of protons.
Answer: The correct image is the one with 5 rows, and 9 hexagons in each row.
Explanation:
Just took the quiz
Answer:
<h2>The period is 0.04 sec</h2>
Explanation:
This problem is based on oscillatory motion.
What is the period of oscillation?
This can be defined as the time taken to complete one full revolution or oscillation.
given that the fly flaps its wings back and forth 25 times in one second. then the frequency is 25 Hz
we know that period T= 1/F
T= 1/25
T=0.04 sec
The reason weather balloons are only partially inflated is to allow room for the helium in the balloon to expand.