The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?
A) 45 days
B) 36 days
C) 54 days
D) 31 days
A
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The frequencies of sound that carry farther in air are
A) low. B) high. C) ultrasonic. D) none of the above
What principle was Copernicus unable to provide evidence against?
a. uniform circular motion b. heliocentric universe c. geocentric universe d. retrograde motion e. Ptolemy's epicycles
If you draw a spacetime diagram, how will the worldline of an object that is stationary in your reference frame appear?
A) vertical B) horizontal C) slanted D) curved E) a circle
Matter Waves: Protons are being accelerated in a particle accelerator. When the speed of the protons is doubled, their de Broglie wavelength will
A. increase by a factor of 4.
B. increase by a factor of 2.
C. decrease by a factor of 2.
D. increase by a factor of 
.
E. decrease by a factor of 
.