A nucleus undergoes beta decay. Which of the following statements is true?
A. The daughter element has the same number of protons as the parent.
B. The daughter element has fewer protons than the parent.
C. Both daughter and parent elements have the same atomic number.
D. The daughter element has more protons than the parent.
Answer: D
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The length and width of a standard sheet of paper is measured, and then the area is found by calculation to be 91.50 in.2 . The number of significant figures in the width measurement must be at least
a. 1. b. 2. c. 3. d. 4. e. 5.
The Jurassic is a(n)
a. epoch. b. era. c. eon. d. period.
Which statement is true?
A. Some electromagnetic waves will pass through walls that light cannot penetrate B. Electromagnetic waves can't travel in perfect vacuum C. Radio waves in the AM band are not electromagnetic waves D. Speed of light in air is lower than in glass E. In air light travels much faster than radiation from a microwave oven
An astronaut weighs 99.0 N on the Moon, where the acceleration of gravity is 1.62 m/ s2. How much does she weigh on Earth?
A) 16.2 N B) 61.0 N C) 99.0 N D) 600 N E) 440 N