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D van der waals force is attractive 5 6 a composite

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D) Van der Waals force is attractive. 5) 6) A composite rectangular solid has material 1 on the bottom and material 2 on the top. The temperature of the bottom is 346.0 e C and the temperature of the top is 298.0 e C. Material 1 has a thermal resistance of .15 K/W, and material 2 has a thermal resistance of .40 K/W. Find the heat-flow rate. Assume the thickness is small compared with the surface area, so heat loss at the edges can be neglected. A) -87 W B) -2,900 W C) -190 W D) 1100 W 6) A-1
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7) What is a WRONG statement? A) An image of an object produced by a flat mirror is seen at different locations by different observers. B) Suggesting that the refractive index of glass decreases with the wavelength of light, we must conclude that in the visible specrtum the polarizing (Brewster) angle for a ray crossing an air-glass interface is smaller for red light that for blue light. C) A virtual image created by a lens can only be seen, when looking through the lens. D) The size of an image of an object produced by a flat mirror does not depend on the distance between the object and the mirror. 7) 8) What of the following is a WRONG statement? A) The intensity of a parallel beam of light is reduced after the beam passes through a diverging lens. B) A parallel beam of light passes through a converging lens, and the intensity of light is measured behind the lens (on the optical axis). The intensity can be higher or lower than in the original parallel beam, depending on at what distance from the lens it is measured. C) In order to make a magnified upright image with a converging lens, the object must be placed at a distance between f and 2f from the lens. D) Surface of diamond reflects substantially more light than surface of glass, because diamond has substantially higher refractive index than glass. 8) 9) What of the following is a WRONG statement? A) Focal length of a diverging lens can be quickly estimated by focusing light from a distant source to a point and measuring the distance between this point and the lens. B) When light travels from water into air its wavelength changes. C) Polarizing angle is greater than 45 e when the light is going from a medium with a lower index of refraction to a medium with a higher index of refraction. D) If a magnifying glass is moved away from a page, at some point the position of the image of the page abruptly moves from infinity in front of the lens to infinity behind the lens. 9) 10) In a single lens camera with a 35 mm wide film, the distance from the lens to the film is varied in order to focus on objects at varying distances. Over what range must the distance vary for a lens of 50 mm focal length, if the camera is to be able to focus on objects ranging in distance from infinity down to 1.4 m from the camera? A) 5.56 mm
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D Van der Waals force is attractive 5 6 A composite...

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