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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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
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 
.
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
The frequencies of sound that carry farther in air are
A) low. B) high. C) ultrasonic. D) none of the above