The half-life of a radioactive element is the time it takes for:
A) half of the radioactive atoms to double themselves.
B) half of the radioactive atoms to decay into isotopes.
C) the radioactive atoms to increase by half of its initial quantity.
D) the radioactive atoms to increase to 1.5 times of its initial quantity.
B
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Why do Terrestrial planets not have rings? a. Terrestrial planets rotate in the opposite direction of the Sun
b. Terrestrial planets do not have large enough masses to retain particles in rings. c. Terrestrial planets have a core too rich in heavy metals to retain rings. d. Terrestrial planets are too close to the Sun to support a ring system. e. Terrestrial planets are not gaseous bodies.
What happens when a planet passes in front of its star (i.e. between the star and us)?
a) The star increases in brightness and the star moves away from us b) The star increases in brightness and the star moves towards us c) The star decreases in brightness and the star moves towards us d) The star does not change in brightness or move relative to us e) The star decreases in brightness and the star moves away fromus
In electromagnetic waves, the electric and magnetic fields vibrate ________ to each other
Fill in the blank(s) with correct word
A speaker can be used as a crude microphone
a. True b. False Indicate whether the statement is true or false