physics

A train moving with a speed of 31.8 m/s sounds a 136-Hz horn. Suppose a stationary observer sounds a horn that is identical to the one on the train. What frequency is heard from this horn by a passenger in the train.

a) 9.8 Hz
b) 31.8 Hz
c) 99 Hz
d) 115 Hz
e) 149 Hz


The fundamental of a closed organ pipe is 261.6 Hz (middle C). The second harmonic of an open organ pipe has the same frequency

what are the lengths of the closed pipe?
A)1m b) .54m C).48 m d) .33m
What are the lengths of open pipe?
A)1.31m b)1m c).37m d).24m

  1. 👍 0
  2. 👎 0
  3. 👁 271
asked by cassie
  1. First question: It depends on the relative speed the passenger has...is he going away, or coming toward the sound?



    On the second question, the length of the pipe if closed on one end, is lambda/4, or length= 1/4 340/261= you do it.

    The second harmonic has a length lambda, so l= 340/261= you do it.

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. A car is traveling in the same direction as the train at 46 m/s. The car’s horn sounds at 550 Hz and the train’s whistle sounds at 360 Hz.

    asked by Need answer by 10pm on January 26, 2014
  2. physics

    A train is moving parallel to a highway with a constant speed of 16.0 m/s. A car is traveling in the same direction as the train with a speed of 36.0 m/s. The car horn sounds at a frequency of 504 Hz, and the train whistle sounds

    asked by Anonymous on March 25, 2012
  3. physics

    A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. A car is traveling in the same direction as the train at 46 m/s. The car’s horn sounds at 550 Hz and the train’s whistle sounds at 360 Hz.

    asked by anonumous on January 26, 2014
  4. physics

    A stationary horn emits a 151 Hz tone. What frequency is heard by a passenger on a train which is moving towards this horn with a speed of 28.7 m/s?

    asked by utl on March 11, 2014
  5. PHYSICS

    A stationary horn emits a 135-Hz tone. What frequency is heard by a passenger on a train which is moving towards this horn with a speed of 31.3 m/s?

    asked by aok on December 7, 2010
  6. science

    Richard stands on the flatbed car of a moving train playing an a on his horn. the note has a fundamental frequency of 220 Hz. Calculate weather or not the train could move fast enough for a stationary observer on the ground to

    asked by chardonay on May 3, 2012
  7. Physics

    Richard stands on the flatbed car of a moving train playing an a on his horn. the note has a fundamental frequency of 220 Hz. Calculate weather or not the train could move fast enough for a stationary observer on the ground to

    asked by chardonay on May 3, 2012
  8. Physics

    A train is moving at a speed of 30 m/s toward a stationary observer at a train station. The train whistle blows with an actual frequency of 336 Hz. What horn frequency is heard by the engineer (riding on the train)?

    asked by Anonymous on March 21, 2014
  9. Physics

    A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 42 dB by an observer 10 km away. (a) What is the average power generated by the horn? W (b) What intensity level of the horn's

    asked by Jake on December 13, 2010
  10. physics

    I need help with this question. A commuter train blows its horn as it passes a passenger platform at a constant speed of 55.0 m/s. The train horn sounds at a frequency of 350 Hz when the train is at rest. (a) What is the frequency

    asked by Chris Adison on April 21, 2008

More Similar Questions