Can an element decay "backward" in the periodic table, to a lower atomic number?
A) No, in fact elements cannot alter their atomic number by radioactive decay.
B) No, but an element can decay to a higher atomic number.
C) Yes, by beta decay.
D) Yes, by alpha decay.
E) Yes, radioactive decay always causes elements to decay to a lower atomic number.
D
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Why isn't the Sun shrinking or expanding at present?
A) because the Sun has lived for billions of years B) Because the Sun is spinning so fast, the centrifugal forces keep the surface of the Sun supported against collapse. C) because gas pressure balances gravity in the Sun D) because the Sun is a solid substance
For vacation, you decide to take a solo boat trip. While contemplating the universe, you lose track of your location. Fortunately, you have some astronomical tables and instruments, as well as a UT clock
You thereby put together the following description of your situation: ? It is the day of the summer solstice. ? The Sun is on your meridian at an altitude of 83.5° in the south. ? The UT clock reads 22:00. a. What is your latitude? How do you know? b. What is your longitude? How do you know?
If we had the most powerful optical microscope in the world stacked on top of the next most powerful optical microscope in the world, we would
1) probably see atoms, 2) probably be able to photograph atoms even if we couldn't see them, 3) still not be able to see an atom, because atoms are 4) invisible. 5) visible when illuminated with infrared light. 6) material particles which have mass and size. 7) smaller than the wavelengths of visible light.
Angular and Linear Quantities: A cylinder of radius 8.0 cm rolls 20 cm in 5.0 s without slipping. Through how many degrees does the cylinder turn during this time?
Fill in the blank(s) with the appropriate word(s).