Question

1. True or False? It is possible for a common hydrogen nucleus to emit an alpha particle.

Hint: An alpha particle is a helium nucleus with two protons and two neutrons. A common hydrogen nucleus has only one proton and no neutrons.

(a) True

(b) False.

16. X-rays are most similar to which of the following:

(a) alpha particles

(b) beta particles

(c) gamma rays

2. True or False? All isotopes of the same element have a different number of protons

(a)True

(b) False

3. Which force tends to hold particles in an atomic nucleus together?

(a) weak force

(b) electric force

(c) magical force

(d) none of the above

4 .. has atomic number 84 (number of protons) and atomic mass number 218 (number of protons and neutrons). It emits an alpha particle and it transforms to a different element X. What’s the atomic mass number of the new element X?

HINT:

is the formula for an alpha particle, a Helium nucleus with atomic number 2 and atomic mass number 4.

(a) 213

(b) 216

(c) 215

(d) 220

(e) none of the above

5. In the previous problem what is the atomic number of the new element X?

(a) 80

(b) 86

(c) 82

(d) none of the above

6. If a sample of radioactive isotopes has a half-life of 1 day, how much of the original sample is left at the end of the second day?

(a) one–half

(b) one quarter

(c) one-eighth

7. In fission, the mass of the original uranium nucleus is

(a) less than the combined mass of the fission fragments

(b) equal to the combined mass of the fission fragments

(c) none of the above

Answer 1

(1) False,

Because hydrogen atoms have lesser mass than alpha particles.

(16) It's answer is option number c. Gamma rays. As it is mass less.

(2) False, because the number of protons is same.

(3) it's answer is option number d. Because the force is nuclear forces.

(4) it's answer is option number e. Because atomic mass number is 214.

(5) it's answer is option number c. 82.

(6) it's answer is option number b. One quarter.

(7) it's answer is option number C.

Because mass of original uranium nucleus is more than the product.