The radioactive isotope 131I (atomic number 53 ) decays to the isotope 131Xe (atomic number 54). What type of radioactive decay is this?
A) electron capture
B) electron ionization
C) beta decay
D) alpha decay
C
Physics & Space Science
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A 0.20-m-long metal rod has a radius of 3.0 cm and a resistance of 2.5 × 10^?5 ?. What is the resistivity of the metal?
a. 1.1E–8 ??m b. 3.5E–7 ??m c. 1.0E–8 ??m d. 1.8E–8 ??m e. 1.2E–7 ??m
Physics & Space Science
In general, sound travels faster through:
a) solids than through gases b) gases than through solids c) gases than through liquids d) empty space than through matter
Physics & Space Science
The gravitational force is a conservative force
Indicate whether the statement is true or false
Physics & Space Science
An atom that has lost an electron is called an ion
a. True b. False Indicate whether the statement is true or false
Physics & Space Science