Answer:
67
Explanation:
- The atomic number (Z) of an atom is equal to the number of protons in the nucleus
- The mass number (A) of an atom is equal to the sum of protons and neutrons in the nucleus
Therefore, calling p the number of protons and n the number of neutrons, for element X we have:
Z = p = 23
A = p + n = 90
Substituting p=23 into the second equation, we find the number of neutrons:
n = 90 - p = 90 - 23 = 67
We will apply the concepts related to Newton's second law. At the same time we will convert everything to the system of international units.
The values of the velocities are,
We know that the acceleration is equivalent to the change of the speed in a certain time therefore
Now applying the Newton's second law we have,
Therefore the approximate magnitude is 8516.36N
The answer is D. They have a higher frequency than X-rays.
Gamma-rays falls in the electromagnetic spectrum above, Gamma-rays have frequencies greater than 10¹⁸ cycles per second, or Hertz (Hz)
<h2>Answer:</h2><h2><em><u>-Rolling friction occurs</u></em></h2><h3><em><u>Thank you for asking this great question need any other help please let me know by commenting below I'd be glad to help. </u></em></h3><h3><em><u>I'd also greatly appreciate you if you mark me as brainliest and click that thanks button.( optional )</u></em></h3><h3><em><u>Your brainly friend ( lauralit1 )</u></em></h3><h2><em><u /></em></h2>
