posted by .

1. How many nodes (counting nodes at the ends), are present in the displacement oscillations of an open-closed tube (oboe) that vibrates in its fourth harmonic?
a) 3 nodes
b) 4 nodes
c) 5 nodes
d) 6 nodes
e) An open-closed tube has no 4th harmonic

2. At a distance of 30 m the noise from the engine of an jet has an intensity of 130 dB. At this level, you will be in pain and your ears will hurt. That's why this intensity is know as the "pain threshold". How far do you have to move from the jet in order for the noise to drop down in intensity to 57.9 dB, a level comparable to that of a spoken conversation?

3. An out-of-tune violin plays an "A" note of 446 Hz. At the same time, a tuning fork vibrates with a true-A of 440 Hz. The frequency of the beats produced (intensity fluctuations) is ...
***Hint: The frequency of the beats is not the same as the frequency of the envelope.***

a) No beats are produced in this situation
b) 1.5 beats per second
c) 3 beats per second
d) 6 beats per second
e) 12 beats per second

  • Physics -

    get a life and do bayer's online homework yourself!

  • Physics -

    1) e!
    3) d (6 beats per s) formula: f_beat = |f1-f2|

    at above! what were you doing here yourself..if not searching for help to do these questions?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Standing waves and resonance (physics)

    A nylon string has a linear density of 7.2g/m and is under a tension of 150N. The fixed supports are 90cm apart. The string is oscillating in the standing wave pattern. Find a)speed b)wavelength c) frequency v=sqr(F/u(linear density) …
  2. Physics, finding harmonics

    A tuning fork with a frequency of 440 Hz is held above a resonance tube that is partially filled with water. Assuming that the speed of sound in air is 342 m/s, for what three smallest heights of the air column will resonance occur?
  3. math

    Problem A: Let T be a balanced 5-ary tree with 81 nodes. (a). How many internal nodes does T have?
  4. physics

    Standing waves on a string are generated by oscillations having amplitude 0.005 m, angular frequency 942 rad/s, and wave number 0.750p rad/m. a.) What is the equation of the standing wave?
  5. Chemistry

    The sizes and shapes of the hydrogen atom orbitals was revealed through graphical analysis of the corresponding wave functions. These wave functions also predict areas that the electrons have a zero probability of being found. These …
  6. Maths

    A full binary tree of height 4 has 15 nodes The 8 nodes at the bottom of the tree are called end nodes or leaf nodes. Two distinct end nodes are uniformly chosen. The expected length of the shortest path between them can be expressed …
  7. chemistry

    1. How many different 4p orbitals are there?
  8. physics

    Decide whether each of the following statements are T-True, or F-False. A) Velocity anti-nodes of standing air waves occur at closed ends of tubes. B) Pressure nodes of standing air waves occur at closed ends of tubes. C) Velocity …
  9. Chemistry

    Consider the 5p orbital of a hydrogen atom. 1. how many different 5p orbitals are there?
  10. ECE

    Assume that a device exists between two nodes A and B of a circuit and that the voltages of these two nodes A and B are equal to 2V and -3V respectively What is the voltage drop across the device?

More Similar Questions