A 550-Hz whistle is moved toward a listener at a speed of 25.0 m/s. At the same time, the listener moves at a speed of 35.0 m/s in a direction away from the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.)
a. 510 Hz
b. 533 Hz
c. 655 Hz
d. 460 Hz
e. 594 Hz
b
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Radiation Activity: The half-life of radioactive iodine-137 is 8.0 days. How many iodine nuclei are necessary to produce an activity of 1.0 ?Ci? (1 Ci = 3.70 × 1010 Bq)
A. 2.9 × 109 B. 4.6 × 109 C. 3.7 × 1010 D. 7.6 × 1012
A Newtonian reflector needs no secondary mirror
Indicate whether the statement is true or false
_____ says that energy must flow from hot regions to cooler regions either by conduction, convection, or radiation
A) The law of energy transport B) The law of conservation of energy C) The theory of energy equilibrium D) The theory of special relativity
Wave Characteristics: At a certain instant in time, the electric field of an electromagnetic wave in free space points in the -z direction, and the magnetic field points in the +y direction. In what direction is this wave traveling?
A. +x direction B. -x direction C. +y direction D. -z direction E. +z direction