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Anonymous users2024-02-10It is easy to get ab cd from the above figure, so the closer to the street lamp, the shorter its shadow, so choose b
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Anonymous users2024-02-09This is because the light emitted by the street lamp is emitted from a point source, and the light travels in a straight line. When an object is closer to a street light, it receives more light and hence the longer the object's shadow is.
We can verify this conclusion through the following experiments. First, we need a street light and an object, such as a small ball. Place the ball at different distances from the street light and observe the shadow of the ball.
When the ball is farther away from the street light, the shadow will be shorter; And when the ball is closer to the street light, the shadow will be longer.
This phenomenon can be explained by the principle of the propagation of light. When the light is emitted from a street lamp, it travels in all directions. When light hits an object, it is blocked by the object, creating a shadow area, which is the shadow of the object.
In addition, the shape of the object and the height of the street lamp also affect the length of the shadow. If the object is a long strip-shaped object, then the length of the shadow will be longer; Whereas, if the object is a round-shaped object, then the length of the shadow will be shorter. This is because a long-shaped object will block more light, while a round-shaped object will only block a portion of the light.
In short, the closer you are to the street light at night, the longer the shadow of the object. This is due to the combination of the propagation principle of light and the position and shape of the object.
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Anonymous users2024-02-08<> from the Shangheng base diagram to the spring is easy to get ab cd, then the closer to the street lamp, the shorter its shadow, so the forest jujube chooses b
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Anonymous users2024-02-07At night, under the street lamp, the closer the person is to the street lamp, the shorter the shadow, the original title is wrong
So the answer is:
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Anonymous users2024-02-06The figure under the street lamp is close to the street lamp, and the shadow is short
2) According to general life experience, it can be obtained: the higher you stand, the greater the range of vision, so the answer is: short; Great
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Anonymous users2024-02-05The farther away a person is from a street lamp, the longer the shadow. Y -- shadow length, S --- the height of the person, A --- the vertical ground of the street lamp and the large hidden angle between the person rolling away from the street lamp. Regularity: y=s*tan(a).
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Anonymous users2024-02-04The drawing is as follows: <>
The figure under the street lamp, close to the street lamp, the shadow is short, far away from the street lamp, the shadow is long
So the answer is: short; long
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Anonymous users2024-02-03The figure under the street lamp, close to the street lamp, the shadow is short, far away from the street lamp, the shadow is long
So the answer is:
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Anonymous users2024-02-02From the above picture, it is easy to get ab cd, then the closer to the street lamp, the shorter its shadow, and the farther away from the street lamp, the longer the shadow
Therefore, a
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