![]() The same molar amount is used in the comparison. For each pair of substances listed here, choose the one having the larger standard entropy value at 25✬. Divinding a long search key into pieces and combining them through addition or a bit wise boolean operation is called A. a) How far must the lens be from the film in order for the resulting picture to be clearly focused? Answer in units of cm. The photographer is taking pictures of ancient trees in a forest and wants the lens to be focused on a very old tree that is 10.4 m away. Why should we favor programming to interfaces over implementations? A nature photographer is using a camera that has a lens with a focal length of 3.06 cm. (a) What is the speed of the star, and (b) is it approaching or receding from the Earth? (c) If the star’s emitted wavelength is the same as the rest value, what is happening?. ![]() The rest wavelength of this line is 656.8 nm. 0.05 T 2T d.0.2 T A spectral line from a star is observed to have a wavelength of 656.5 nm. If in the experiment, the wire carrying a current 2.0 Ahow strong is the magnetic field? 2.0.1 T b. True o False In magnetic force on a current carrying wire" expriment using the data for force (y-axis, in Newton) versus length in meters), someone obtained a linear curve fit countion: y=0.1x+2. 5 3 in Z1o When an automobile rolls on pavement, the instantaneous center of one of its wheels is located on the wheel axle. Find the values for each of the following: a. But the music from all instruments arrives in cadence independent of distance, and so all frequencies must travel at nearly the same speed.6. Suppose that high-frequency sounds traveled faster-then the farther you were from the band, the more the sound from the low-pitch instruments would lag that from the high-pitch ones. If this independence were not true, you would certainly notice it for music played by a marching band in a football stadium, for example. This independence is certainly true in open air for sounds in the audible range of 20 to 20,000 Hz. One of the more important properties of sound is that its speed is nearly independent of frequency. The time for the echo to return is directly proportional to the distance. A bat uses sound echoes to find its way about and to catch prey. Figure 3 shows a use of the speed of sound by a bat to sense distances. \boldsymbolit is 343 m/s, less than a 4% increase. The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: Similar arguments hold that a large instrument creates long-wavelength sounds. So a small instrument creates short-wavelength sounds. High pitch means small wavelength, and the size of a musical instrument is directly related to the wavelengths of sound it produces. Small instruments, such as a piccolo, typically make high-pitch sounds, while large instruments, such as a tuba, typically make low-pitch sounds. The wavelength of sound is not directly sensed, but indirect evidence is found in the correlation of the size of musical instruments with their pitch. You can also directly sense the frequency of a sound. The flash of an explosion is seen well before its sound is heard, implying both that sound travels at a finite speed and that it is much slower than light. You can observe direct evidence of the speed of sound while watching a fireworks display. Sound, like all waves, travels at a certain speed and has the properties of frequency and wavelength. Sound travels more slowly than light does. When a firework explodes, the light energy is perceived before the sound energy. Describe the effects of temperature on the speed of sound.įigure 1.Describe the effects on the speed of sound as it travels through various media.Describe the relationship between the speed of sound, its frequency, and its wavelength.
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