In the nucleus of an atom, the strong force is a relatively
The strong force acts between 50%
69% 1. 2. 3. 4.
In class activities
A. short-range force. long-range force. unstable force. D. neutralizing force.
1. 2. 3. 4.
January 28, 2010 Morning results
A. protons. neutrons. nucleons. D. all of the above.
32%
26% 15% 6%
3%
0% 1
The radioactive decay of nature’s elements occurs in the
2
4
Of alpha, beta, and gamma radiation, two are high-speed particles, and the one that isn’t is
92% 1. 2. 3. 4.
3
A. soil we walk on. air we breathe. interior of Earth. D. all of the above.
1
3
4
When an element ejects an alpha particle, the mass number of the resulting element 43%
46% 1. 2. 3. 4.
2
A. alpha. 35% beta. gamma. D. all of the above are different forms of electromagnetic waves.
1. 2. 3. 4.
A. reduces by 2. reduces by 4. increases by 2. D. increases by 4.
34%
16% 11% 8% 0% 1
3%
0% 2
3
4
When an element ejects a beta particle, the atomic number of that element 44% 1. 2. 3. 4.
A. reduces by 1. increases by 1. reduces by 2. D. increases by 2.
1
22%
2
3
4
Which of these is actually a high-speed electron? 1. 2. 3. 4.
25%
11%
1
2
3
4
Which of these is the most penetrating in common materials? 69%
51%
A. Alpha. Beta. Gamma. D. All of the above are high speed.
1. 2. 3. 4.
31%
A. Alpha. Beta. Gamma. D. All of the above are equally penetrating.
26% 17% 8% 3%
0% 1
2
3
4
1
2
3
4
1
2
3% 3
4
1
morning class didn't get to the last 5 slides
When thorium-234 emits a beta particle, thorium transforms to 86%
1. 2. 3. 4.
A. protactinium-232. protactinium-233. protactinium-234. D. protactinium-235.
Which of these radioactive elements is gaseous at 25% 25% 25% everyday temperatures? 1. 2. 3. 4.
When food is exposed to gamma radiation, the food 25%
25% 1. 2. 3. 4.
A. Uranium. Plutonium. Radium. D. Radon.
25%
25%
25%
A. unfortunately becomes slightly radioactive. doesn’t become radioactive at all. will spoil faster. D. becomes quite radioactive and should be avoided by healthconscious people.
9%
6% 0% 1
2
3
4
A certain isotope has a half-life of one day. This means the amount of that isotope remaining at the end of three days will be 1. 2. 3. 4.
A. zero. one-quarter. half. D. one-eighth.
1
2
3
4
3
4
The half-life of uranium-238 is 4.5 billion years. Compared with the amount of uranium-238 in the Earth today, only half this amount will exist in
1. 2. 3. 4.
1
2
1
1
2
3
4
3
When uranium-238 emits an alpha particle, uranium 25% 25% 25% transforms to 1. 2. 3. 4.
A. less than 4.5 billion years. 4.5 billion years. more than 4.5 billion years. D. none of the above.
2
4
25%
A. thorium-242. thorium-238. thorium-234. D. any of the above thorium isotopes.
1
2
3
4
2
