# 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? 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)
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