PHY 101 Week 4 Learning Team Assignment Textbook Exercises
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?
- 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
- 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
Preview of solution:
Chapter 19 (Questions 12 and 36)
12.) If a wad of clay is placed on the free end of a clamped hacksaw blade, the vibration frequency of the blade, ??? suspension point and since the distance between the suspension point and the center of gravity or mass increases which increase the moment of inertia, decreases. This will increase the period duration and the frequency decreases. A wad of clay, stuck in the middle of the blade will not displace the center of gravity as much XXX is the same, since so the system does not change will decrease the resonance frequency less. Thus, you cannot change the duration and frequency. XXX
36.) Due to the relative motion between the source and listener, the sound standard because of a change in the pitch of the sound is clear and when the listener is in motion, there is a Doppler effect. The listener to hear the sound of a low frequency to high frequency sound to move toward the left. ??????
When moving toward the sound the listener will encounter each wave faster than he would if he were stationary and vice versa. In order to hear a higher frequency the listener needs to move towards to the sound. To hear a low frequency the listener has to move away from the sound.
Chapter 20 (Questions 16, 21, and 23)
16.) When air is pumped out of the jar it creates a vacuum; that is, a region devoid of matter. Sound waves need the air as a medium to travel in, therefore we cannot hear the bell ring. While the differences in the properties of light and sound waves ??? sound XXX light waves do not need any medium, which indicates that their spread will require a medium. so it is possible to see the bell ring.
21.) It is the sound of a low temperature, ???
because cold air molecules travels slower. they will take longer to collide. Warm air has a high temperature, so the molecules are moving faster and will hit and push each other around sooner. and thus, the sound velocity is higher.
23.) Speed of sound in air, heat, and are not affected by other conditions, if sound distortion cannot be. This is because the sound distortion that occurs when there is a change of medium. ????????? No. Refraction occurs due to sound traveling at a different speeds in various different places -- such as places on the sound wave fronts moving at different speeds due to environmental conditions. Without such changes in sound speed there would be no refraction.onlinehomeworkexperts@gmail.com
Chapter 19 (Questions 12 and 36)
12.) If a wad of clay is placed on the free end of a clamped hacksaw blade, the vibration frequency of the blade, ??? suspension point and since the distance between the suspension point and the center of gravity or mass increases which increase the moment of inertia, decreases. This will increase the period duration and the frequency decreases. A wad of clay, stuck in the middle of the blade will not displace the center of gravity as much XXX is the same, since so the system does not change will decrease the resonance frequency less. Thus, you cannot change the duration and frequency. XXX
36.) Due to the relative motion between the source and listener, the sound standard because of a change in the pitch of the sound is clear and when the listener is in motion, there is a Doppler effect. The listener to hear the sound of a low frequency to high frequency sound to move toward the left. ??????
When moving toward the sound the listener will encounter each wave faster than he would if he were stationary and vice versa. In order to hear a higher frequency the listener needs to move towards to the sound. To hear a low frequency the listener has to move away from the sound.
Chapter 20 (Questions 16, 21, and 23)
16.) When air is pumped out of the jar it creates a vacuum; that is, a region devoid of matter. Sound waves need the air as a medium to travel in, therefore we cannot hear the bell ring. While the differences in the properties of light and sound waves ??? sound XXX light waves do not need any medium, which indicates that their spread will require a medium. so it is possible to see the bell ring.
21.) It is the sound of a low temperature, ???
because cold air molecules travels slower. they will take longer to collide. Warm air has a high temperature, so the molecules are moving faster and will hit and push each other around sooner. and thus, the sound velocity is higher.
23.) Speed of sound in air, heat, and are not affected by other conditions, if sound distortion cannot be. This is because the sound distortion that occurs when there is a change of medium. ????????? No. Refraction occurs due to sound traveling at a different speeds in various different places -- such as places on the sound wave fronts moving at different speeds due to environmental conditions. Without such changes in sound speed there would be no refraction.onlinehomeworkexperts@gmail.com
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