Multiple Choice
A certain radioactive element has a half-life of 20 d.The time it will take for 7/8 of the atoms originally present to disintegrate is
A) 20 d
B) 40 d
C) 60 d
D) 80 d
E) 100 d
Correct Answer:
Verified
Correct Answer:
Verified
Q90: A thermal neutron<br>A)produces electrons by thermionic emission.<br>B)produces
Q91: The sodium atom has an atomic number
Q92: Which of these nuclear reactions is possible?<br>A)
Q93: As <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6079/.jpg" alt=" As
Q94: The intensity of gamma rays passing
Q96: The half-life of radium is about 1600
Q97: The energy at which the <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6079/.jpg"
Q98: Estimate the mass density of the nucleus
Q99: The following fusion reaction occurs in the
Q100: Many elements show resonances in neutron capture.What