Alpha decay occurs in some radioactive nuclides with A > 150. The probability of an alpha particle being emitted depends on the energy of the alpha particle. Why is this so?
b.
Many of the alpha particles emitted in nuclear decay do not have the classically defined energy to surmount the potential barrier of the strong nuclear force. Higher energy particles, however, do have higher probabilities of getting out due to the decreasing potential over distances. They have less of the classically forbidden "region" to pass through.
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The light-gathering power of a telescope increases as the size of the objective increases
a. True b. False Indicate whether the statement is true or false
The planets (other than Earth) known to ancient Western cultures were ________.
A. Mercury, Mars, Jupiter, and Saturn B. Venus, Mars, Jupiter, and Saturn C. Venus, Jupiter, Saturn, Uranus, and Neptune D. Mercury, Venus, and Mars E. Mercury, Venus, Mars, Jupiter, and Saturn
Two blocks connected by a string are pulled across a horizontal surface by a force applied to one of the blocks, as shown. The coefficient of kinetic friction between the blocks and the surface is 0.25. If each block has an acceleration of 2.0 m/s2 to the right, what is the magnitude F of the applied force?
?
?
A. 25 N B. 18 N C. 11 N D. 14 N E. 7.0 N
A small glider is coasting horizontally when suddenly a very heavy piece of cargo falls out of the bottom of the plane. You can neglect air resistance. Just after the cargo has fallen out
A) the plane speeds up and the cargo slows down. B) the plane speeds up but the cargo does not change speed. C) neither the cargo nor the plane change speed. D) the cargo slows down but the plane does not change speed. E) both the cargo and the plane speed up.