What is the period of one vibration of this tone as the

Question

1. What is the frequency, in hertz that corresponds to each of the following periods?

(a)  0.10 s

(b) 5 s

(c)  I /60 s

2. What is the period, in seconds, that corresponds to each of the following frequencies?

(a) 10 Hz

(b) 0.2 Hz

(c) 60 Hz

3. A skipper on a boat notices wave crests passing his anchor chain every 5 s. He estimates the distance between wave crests to be 15 m. He also correctly estimates the speed of the waves. Show that this speed is 3 nus.

4. A weight suspended from a spring is seen to bob up and down over a distance of 20 cm twice each second. What is its frequency? Its period? Its amplitude?

5. A mosquito flaps its wings 600 vibrations per second, which produces the annoying 600-Hz buzz. Given that the speed of sound is 340 m/s, how far does the sound travel between wing beats? In other words, find the wave­length of the mosquito's sound.

6. On a keyboard, you strike middle C, whose frequency is 256 Hz.

(a) What is the period of one vibration of this tone?

(b) As the sound leaves the instrument at a speed of 340 m/s. What is its wavelength in air?

7. As shown in the drawing, the half-angle of the shock wave cone generated by a supersonic airplane is 45°. What is the speed of the plane relative to the speed of sound?

8. An astronaut on the Moon attaches a small brass ball to a 1.00-m length of string and makes a simple pendulum. She times 15 complete swings in a time of 75 seconds. From this measurement she calculates the acceleration due to gravity on the Moon. What is her result?

Answer 1

Answer the following questions of physics by applying the concepts and theories of waves and frequency all along with the formulas used to solve the numerical part. Q1. Find the period, in seconds, which corresponds to each of the given frequencies? a) 10 Hz b) 0.2 Hz and c) 60 Hz Q2. A skipper on a boat observes wave crests passing his anchor chain each and every 5 s. He predicts the distance between wave crests to be 15 m. He as well properly estimates the speed of the waves. Illustrate that this speed is 3 nus. Q3. A weight suspended from the spring is observed to bob up and down over a distance of 20 cm twice each and every second. Determine its frequency or its period and its amplitude?