20 13—20 14 physics reference answers for the final examination paper of the first semester in Nanchang.

, fill in the blank (every space 1 minute, * *14 minute), the appearance is as shown in the figure, the steel ruler presses on the desktop, unfolds the desktop switch part, reaches one end, flicks, redials the ruler, the sound of the steel ruler is different, extends the desktop from the ruler of _ _ _ _ _ _ _ _ _ _, and then steel. "Tone, loudness, tone (optional) 2 Mid-Autumn Festival night, bright and starry, we strolled on the tree-lined path, the warm wind blew, and the leaves rustled. Moonlight passes through layers of leaves, forming a dot on the earth and wiping the coins on the earth ... Have you ever thought of: (1) the rustling sound of leaves; (2) The dots on the earth are actually the moon (fill in "real image" or "virtual image"), which is called physics? Xiaoming wrote a few words on the white paper in blue ink. Only in the red darkroom can he see the colors and colorful words of the newspaper. 4. Plane mirror, the incident beam angle of incident light and reflected light is 35 degrees/>; 5 stars, the focal lengths of the two convex lenses A and B are the same, and it is known that the focal length is greater than B. In order to make full use of the convex lens, the light that should be put in the small bulb is a parallel bulb convex lens. 7. When the lens in front of the object has a convex lens with a focal length of F 18cm on the screen. > 830 cm vertical scale, the temperature of the object _ _ _ _ _ _ _ _ _ _ _ The working principle of the thermometer is to use liquid _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. Explore () 1 1. Tang Tian Temple with Echo Wall is a miracle in the architectural history of China. The acoustic characteristics of the application principle of echo wall are as follows: () A. Transmission of sound on the wall B. Reflection of sound C. Refraction of transmitted sound in air D. After using 12, the water depth of the swimming pool is 3 meters. For example, from the moon pool: 3.8x105km () a.3mb.6mc.7.6x105km d.3.8x105km13 is on the water surface of the earth and the moon, as shown in the following figure, light air from the light path enters the water (indicating). For TV that does not affect the sound, Lingling is more suitable to adopt the following methods () A: Turn off the TV. Turn down the TV. C. turn on the radio D. 15 open the doors and windows of the study and living room. At night, as you approach, the street outline lights will change. () AB is a gradually shortened variable length. C. the variable length is short. D. Make it shorter first, and then change it to BR/& gt；; 16 A, b two cups of ice melt AB cup shade, the temperature of two cups of water is equal to B in (), A is higher than BCA and lower than BD, BR/& gt；; 17 cannot determine the optical instrument for imaging. The following statements are correct: (a) The periscope is equipped with a virtual camera with a vertical narrow image. B. erect a real d. projector with a vertical magnifying glass. Physical research points out that the following passage from Kobayashi is incorrect. () A. A convex lens can only be a real image. 19 refracted from the other side of the center of the lens optical axis, and one of the parallel rays along the main optical axis was incident on the convex lens 12 cm, which passed through the lens and lamp of the main optical axis of the candle and the lens of 6 cm twice (), and it was a real image B such as a CD, like a lighted candle and a convex lens on a desktop screen, and vice versa. And their centers are the convex lens with the same height on the mobile platform and a vertical virtual image mask, so that the light is reversed, the candle to enlarge the real image is exchanged with Xu Guangping (real-time image mask D), an inverted enlarged real image B is inverted to reduce three virtual image mapping problems (paper 3 points, ***6 points) 2 1, Xiaoming's ping-pong ball falls on the sofa, without a flashlight and Xiaoming's ping-pong mirror. The reflected light and incident light of the plotted plane mirror will calculate the angle of reflectivity at the appropriate position in the figure. 22. As shown in the figure, the same experimental Xu Guangping is used to query the imaging law of convex lens. Draw the 200 1, the target and its optical path diagram in the corresponding experimental inquiry questions (5 +3 +3, * * 7: 18) 23. The sea at night in Penglai City, Shandong Province? A beautiful spectacle-the "canopy" on Penglai Pavilion, a mirage, rippling blue waves. Clear water surrounds the city. There seems to be a building in front of the center of the screen, and the roads in the city can still be seen. " Flying horses in the sky shuttle from time to time ... According to the given materials, please answer: What is the physical phenomenon of the materials mentioned in item (1)? Mainly because: (1) (2) What is the phenomenon? (2)(3) In addition to the above-mentioned material phenomena, give two examples of the same phenomenon. (2) 24, as shown in the figure, a classmate "explored the imaging characteristics of a flat mirror" in the experiment. The table is stamped with a piece of white paper, and then a horizontal line is drawn in the middle, along the vertical line and a piece of glass. Put it away. Take two long candles and light them in front of the glass. Then use candle B to move the glass back and forth. (1) Adjust the position of candle B until it looks like the position on B is lit, as if there is one. (2) Position, find the position of a connected candle and candle B. This plane is connected with the glass plate, and the relationship between two candles with the same length. 25. As shown in the figure, "Experimental diagram for studying convex lens imaging. The optical screen (not shown) obtained in (1) significantly reduces the real image. Candles may be placed at five points, A, B, C, D and E, far away from the camera. This machine uses this imaging function (2) to create electronic candles (fill in "Add" or "Down") (fill in "Enlarge"). (4) The candle you really like should be put in these 26 experiments to explore the imaging law of convex lens: (1) First, install the equipment and adjust the flame candle, lens and light screen, even if it is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. Topic (3+5) applied along _ _ _ _ _ _ _ _ _ (fill in "up" or "down") 5 May 27th, Ruby of MIT? 1962, laser was launched on the moon. After receiving the goods, the signal is reflected from the laser on the moon to calculate the distance from the earth to the moon. On May 28th, the first experiment measured the propagation speed of cast iron in Paris by the following methods: two kinds of bells were heard at one end of the cast iron pipe and the other end of the pipe. What's going on here? If the length of the pipeline is 93 1 m, the time interval between two sounds is 2.5 seconds, and if the speed of sound propagation in air is 340M/S, find the sound in cast iron. Fill-in-the-blank loudness sound (1) vibrates air (2) real-time image pinhole imaging .../> 4,705 red and black b 6,7,9 cm focus