A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is 8 minutes
a. True
b. False
Indicate whether the statement is true or false
True
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A throbbing pulse of electromagnetic radiation is called a
A) proton. B) photon. C) phototron. D) newtron. E) nooytron.
Magnetic Field of a Current Loop: What is the strength of the magnetic field at the center of a circular loop of wire of diameter 8.0 cm when a current of 2.0 A flows in the wire? (?0 = 4? × 10-7 T ? m/A)
Fill in the blank(s) with the appropriate word(s).
Winter and summer differ in length on Mars because of its elliptical orbit
Indicate whether the statement is true or false
Charge A has 10 electric field lines coming out, charge B has 20 lines coming out, and charge C has 30 lines coming in. Which pair of these charges will have the largest force between them if placed one cm apart?
a. A and B c. More information is needed. b. B and C d. C and A