A toy - car, blowing its horn, is moving with a steady speed of 5 m/s, away from a wall. An observer, towards whom the toy car is moving, is able to hear 5 beats per second. If the velocity of sound in air is 340 m/s, the frequency of the horn of the toy car is close to: a.680 Hz b.510 Hz c.340 Hz d.170 Hz

Other Physics Questions

• Modern vacuum pumps can evacuate a vessel down to a pressure of 4.0 x 10^-15atm. at room temperature (300 K). Taking R = 8.3 KJ^-1 mole^-1, 1 atm = 10^5 Pa and NAvogradro = 6 x 10^23 mole^-1 , the mean distance between molecules of gas in an evacuated vessel will be of the order of a.0.2mu m b.0.2 mm c.0.2 cm d.0.2 nm
  Author:

  joseph

  1 year ago
• Modulation is necessary for : | Physics Questions a.Multiplexing of signal b.Reducing noise in signal c.Reducing height of antenna d.All of these
  Author:

  cookie19

  1 year ago
• An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20 . To the observer the tree appears: a.10 times taller b.10 times nearer c.20 times taller d.20 times nearer
  Author:

  princesssbkl

  1 year ago
• A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly a.1.34 V/m b.2.68 V/m c.4.02 V/m d.5.36 V/m
  Author:

  punkypvl

  1 year ago