A student has a small battery-powered alarm buzzer. The student throws the buzzer toward a stationary wall (possibly due to frustration following a physics midterm examination). The buzzer emits sound with a frequency of 74 Hz, and the wall reflects the sound. If the buzzer is moving directly away from the student (and directly toward the wall) with a speed of 2.3 m/s, what beat frequency would the student hear?
The speed of sound is 340 m/s. The student stands still after throwing the buzzer.

  1. 👍 1
  2. 👎 4
  3. 👁 1,243
  1. F2 = (Vs_Vr)/(Vs+Vg) * F1.
    F2 = (340-0)/340+2.3) * 74 = 73.5 Hz.

    Fb = F1-F2 = 74 - 73.5 = 0.5 Hz.

    1. 👍 0
    2. 👎 30

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    Two students are on a balcony 19.6 m above the street. One student throws a ball vertically downward at 14.7 m/s. Att the same instant, the other student throws a ball vertically upward at the same speed. The second ball just

  2. physics i need help

    A student connects a battery to a light bulb using wires, creating a closed simple circuit. The student connects an ammeter to the circuit and places a compass next to the wires. The student then decides to connect a second

  3. Spirit of math

    In a certain factory a buzzer and bell both sound together at 9 a.m. every day, when the factory opens. The buzzer buzzes every 1 3/5 hours after that, and the bell gongs every 54 minutes. When they both sound together again the

  4. science

    A student makes the following statement: Chocolate- covered donuts are 10 times better than plain, glazed donuts. Which of the following correctly describes the student’s statement? a-The student’s statement is a quantitative

  1. physics

    Two students on roller skates stand face-toface, then push each other away. One student has a mass of 95 kg and the second student 60 kg. Find the ratio of the magnitude of the first student’s velocity to the magnitude of the

  2. physics

    A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 18.0 m/s. The student throws a ball along a path that she judges to make an initial angle of 68.0° with the

  3. Math

    A student experiences difficulty with malfunctioning alarm clocks. Instead of using one alarm clock, he decides to use three. What is the probability that at least one alarm clock works correctly if each individual alarm clock has

  4. Physics

    Two students are on a balcony 19.6 m above the street. One student throws a ball (ball 1) vertically downward at 15.8 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The

  1. math

    2. Mrs. young has her 18 students seated in a circle. They are evenly spaced and numbered in order. which student is directly opposite these three students? .student#1? .student#5? .student#18?

  2. physics

    A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.6 kg m^2. A second student tosses a 1.5 kg mass with a speed of 2.9 m/s to the student on the stool,

  3. Physics

    The spring shown in the figure is compressed 59cm and used to launch a 100 kg physics student. The track is frictionless until it starts up the incline. The student's coefficient of kinetic friction on the 30∘ incline is 0.14 .

  4. physics

    The 80kg student balances a 1300kg elephant on a hydraulic lift. (U-Tube) What is the diameter of the piston the student is standing on? When a second student joins the first, the height difference between the liquid levels in the

You can view more similar questions or ask a new question.