แบบทดสอบวิชาวิทยาศาสตร์(ว32101)ชั้นมัธยมศึกษาปีที่ 2

สีม่วงมีความถี่มากที่สุดเนื่องจากมีความยาวคลื่นสั้นที่สุดในสีทั้งหมด ซึ่งส่งผลให้มีความถี่สูงกว่าสีอื่นๆ และมีพลังงานคลื่นสูงกว่าสีอื่นๆ ดังนั้นสีม่วงจึงมีความถี่มากที่สุด

The correct answer is "มีตัวกลางพาไป" (does not have a medium to propagate through). This is because light can travel through a vacuum, such as outer space, where there is no medium present.

In order to increase reflection, a reflective surface is needed. Among the given options, only a mirror (กระจกเงา) is a reflective surface. Therefore, AB should be a mirror to achieve a higher reflection.

The correct answer is "รังสีอุลตราไวโอเลต" because ultraviolet radiation is a type of radiation that falls in the violet portion of the electromagnetic spectrum, which is also known as ultraviolet light.

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When a perfume bottle is placed in front of a mirror, the image of the bottle appears to be located behind the mirror. The distance between the mirror and the viewer's eye is 10 centimeters, and the distance between the mirror and the bottle is 20 centimeters. According to the mirror equation, which states that the object distance plus the image distance equals the focal length of the mirror, the image distance is equal to the difference between the object distance and the focal length. In this case, the focal length is 30 centimeters (10 + 20), so the image distance is 30 - 20 = 10 centimeters. Therefore, the image of the perfume bottle appears to be 50 centimeters away from the viewer's eye.

กระจกเงาไม่ให้แสงผ่านผ่านได้เนื่องจากมีการเคลือบสารที่สามารถสะท้อนแสงได้มากกว่าการส่งผ่านแสง ซึ่งทำให้แสงที่เข้ามาชนกับกระจกเงาจะถูกสะท้อนกลับออกไป ทำให้ไม่สามารถผ่านไปถึงอีกด้านหนึ่งของกระจกได้

The given statement states that "incident rays, reflected rays, and normal lines are in the same plane and the angle of incidence is equal to the angle of reflection." This is a definition of the law of reflection, which states that when light rays are reflected off a surface, the angle of incidence (the angle between the incident ray and the normal line) is equal to the angle of reflection (the angle between the reflected ray and the normal line). Therefore, the correct answer is "กฎการสะท้อนของแสง" which translates to "the law of reflection of light."

รังสีตกกระทบ รังสีสะท้อน และเส้นปกติอยู่บนระนาบเดียวกัน เป็นกฏการสะท้อนของแสงที่ว่า เมื่อแสงถูกส่องตกกระทบหรือสะท้อนที่พื้นผิวของวัตถุ แสงที่สะท้อนออกจากวัตถุนั้นจะตามทิศที่เส้นปกติกับพื้นผิวของวัตถุ ส่วนแสงที่ตกกระทบจะมีทิศตรงกันข้ามกับเส้นปกติ รังสีสะท้อนคือแสงที่สามารถเอาฉากรับได้ ในข้อนี้กล่าวถึงว่ารังสีตกกระทบ รังสีสะท้อน และเส้นปกติอยู่บนระนาบเดียวกัน

เมื่อแสงตกกระทบวัตถุทึบ แสงจะถูกสะท้อนกลับออกจากวัตถุและเปลี่ยนทิศทาง โดยเกิดการสะท้อนแบบมีระเบียบ ผิวของวัตถุที่เรียบจะช่วยให้แสงสะท้อนไปในทิศทางเดียวกัน ทำให้เกิดการสะท้อนแบบมีระเบียบ

The image in the question shows a reflection of the clock. The hour hand is between 4 and 5, while the minute hand is on the 1-minute mark past the hour. Therefore, the correct time is 4:05.

When an object is placed between two parallel mirrors at an angle of 75 degrees, it will create multiple reflections. The number of images formed can be determined by using the formula: (360 degrees)/(angle of inclination - 180 degrees). In this case, the angle of inclination is 75 degrees. Plugging in the values, we get (360)/(75-180) = (360)/(-105) = -3.42. Since we cannot have a negative number of images, we take the absolute value, which gives us 3.42. Since we cannot have a fraction of an image, we round down to the nearest whole number, which is 3. However, we also need to consider the original object, so we add 1 to the result. Therefore, there will be a total of 4 images formed. These images will be virtual, meaning they cannot be projected onto a screen, and will appear to be behind the mirrors, hence the term "เสมือนทั้งหมด" (virtual).

When light reflected from an object enters the eye, we perceive the colors green, red, and absence of color. In this case, the colors are perceived in the order green, red, and absence of color. Therefore, the object would appear green, red, and black.

The correct answer is YXO because it is the only option where the angle formed at the vertex is less than 90 degrees. In the other options, the angles formed at the vertex are greater than 90 degrees, which makes them obtuse angles.

When students look at themselves in a shadowed mirror, the image they see is a reflection of what is behind the mirror. This is because a shadowed mirror does not reflect light as clearly as a regular mirror, causing the image to appear faint or blurred. Therefore, the correct answer is "ภาพเสมือนหลังกระจก" which translates to "a reflection behind the mirror."

The angle between the two mirrors needs to be such that when light reflects off both mirrors, it creates four distinct images. In this case, an angle of 72 degrees will achieve this result.

When light hits the surface of an object, it can either be reflected or refracted. The angle at which the light ray hits the surface is called the angle of incidence, and the angle at which it bounces off or is transmitted through the surface is called the angle of reflection or refraction, respectively. According to the law of reflection and the law of refraction, the angle of incidence is equal to the angle of reflection, and the angle of incidence is not necessarily equal to the angle of refraction. Therefore, the correct answer is "มุมตกกระทบเท่ากับมุมสะท้อน" (the angle of incidence is equal to the angle of reflection).

When light reflects off a mirror, the angle of incidence is equal to the angle of reflection. In this case, the two mirrors are angled at 50 degrees to each other. Each time the light reflects off one mirror, it creates a new ray of light that can reflect off the other mirror. The number of images formed can be determined by dividing 360 degrees (a full circle) by the angle between the mirrors, which is 50 degrees. 360/50 = 7. Therefore, there will be 7 images formed from the reflection of light off the two mirrors.

The girl is sitting 2 meters away from the mirror and the lamp is 2 meters behind her. The distance between the girl and the lamp is 2 meters, and the distance between the girl and the mirror is also 2 meters. Therefore, the distance between the girl and the lamp is 2 meters, and the distance between the girl and the mirror is also 2 meters. When the girl looks at the mirror, she sees the reflection of the lamp, which is 2 meters away from her. So, the total distance between the girl and the reflection of the lamp in the mirror is 2 meters + 2 meters = 4 meters.

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