PHY 101 Week 4 Learning Team Assignment Textbook Exercises

PHY 101 Week 4 Learning Team Assignment Textbook Exercises Recent

Chapter 19

            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?

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?

 

Chapter 20

            2. For years, marine scientists were mystified by sound waves detected by underwater microphones in the Pacific Ocean. These so-called T-waves were among the purest sounds in nature. Eventually they traced the source to underwater volcanoes, whose rising columns of bubbles resonated like organ pipes. What is the wavelength of a typical T-wave whose frequency is 7 Hz? (The speed of sound in seawater is 1530 m/s.)

4. A bat flying in a cave emits a sound and receives its echo 0.1 s later. Show that its distance from the cave wall is 19 m

 

Chapter 26

            4. Show that it would take 2.5 s for a pulse of laser light to reach the Moon and to bounce back to Earth

6.      A ball with the same diameter as a light bulb is held halfway between the bulb and a wall, as shown in the sketch. Construct light rays (similar to those in Figure 26.14) and show that the diameter of the umbra on the wall is the same as the diameter of the ball and that the diameter of the penumbra is 3 times the diameter of the ball

2. Show with a simple diagram that when a mirror with a fixed beam incident upon it is rotated through a certain angle, the reflected beam is rotated through an angle twice as large. (This doubling of displacement makes irregularities in ordinary window glass more evident.)

 

4. When light strikes glass perpendicularly, about 4% is reflected at each surface. Show that 92% of light is transmitted through a pane of window glass