A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound to be 340 m/s. What frequency does the whistle actually produce?
A) 444 Hz
B) 439 Hz
C) 364 Hz
D) 361 Hz
Question 2
A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)
A) The electric field is zero inside the conductor.
B) All the free electrons go to the surface of the conductor.
C) The surface of the conductor is neutral.
D) The electric field just outside the surface of the conductor is perpendicular to the surface.
E) None of the above statements are correct.
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Anatomy of the ear and how we hear.
Anatomy of the ear and how we hear