When observing an object, such as a space ship that is moving very quickly relative to you, the length of objects on that object will appear to be
A) longer than when they are at rest.
B) the same length as when they are at rest.
C) shorter than when they are at rest.
D) narrower than when they are at rest.
E) wider than when they are at rest.
C
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A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotron?
A) 3.7 keV B) 7.8 keV C) 8.7 keV D) 7.8 MeV E) 8.7 MeV
How long was this exposure?
a. a few seconds
b. a few minutes
c. a few hours
d. a few days
e. a few weeks
A certain source of sound waves radiates uniformly in all directions. At a distance of 20 m from the source the intensity level is 51 db. What is the total acoustic power output of the source, in watts?
(Note: The reference intensity I0 is 1.0 × 10-12 W/m2.)
What should be the height of a dipole antenna (of dimensions 1/4 wavelength) if it is to transmit 1200 kHz radiowaves?
A. 11.4 m B. 60 cm C. 1.12 m D. 62.5 m E. 250 m