Earth receives 1400 W/m² of solar power. If all the solar energy falling on a lens of area 0.2 m² is focussed onto a block of ice of mass 280 g, the time taken to melt the ice will be...minutes. (Latent heat of fusion of ice = 3.3 x 10^5 J/kg)
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- A converging lens has (1.8300x10^1) cm focal length, and is placed (4.00x10^0) cm behind a diverging lens. Parallel light strikes the diverging lens. After passing through the converging lens, the light is again parallel. What is the focal length of the diverging lens? give your answer in the unit of cm with 3 s.f. and follow the sign convention of lenses. (Hint: draw a ray diagram) Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: х10 Answer= 1.30 x 104°C-1). At room temperature (20.0°C), the frames have circular lens A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion holes 2.23 cm in radius. To what temperature must the frames be heated if lenses 2.24 cm in radius are to be inserted into them?(a) An opaque cylindrical tank with an open top has a diameter of 2.65 m and is completely filled with water. When the afternoon sun reaches an angle of 31.0° above the horizon, sunlight ceases to illuminate any part of the bottom of the tank. How deep is the tank (in m)? m (b) What If? On winter solstice in Seattle, the sun reaches a maximum altitude of 19° above the horizon. What would the depth of the tank have to be (in m) for the sun not to illuminate the bottom of the tank on that day? m
- You can get a sunburn on a cloudy day, but you can’t get a sunburn even on a sunny day if you are behind glass. Explain.You are on a snorkeling trip. Deep below the water, you look up at the surface of the water. Right at sunset, at what angle from the vertical do you see the sun?What would be the refractive index of a compound at 20 C, if its refractive index was at 22.9 C and 1.4730 ?
- (p) V45° 45° T2 60° 60° T3 TA T1 T2 N T3 T4 650 N I| || ||What percent of directly incident sunlight is transmitted into water (n=1.33)? (Give your answer as a percent.)Humans are unable to convert radiant energy from the sun into stored energy that can be usedto do work. Plants, however, obtain their energy from photosynthesis – sunlight is used toconvert carbon dioxide and water into sugars (stored as an energy source) and oxygen.Consider a leaf with a surface area of 2.5 cm2. On a sunny day it might receive sunlight withan average power per unit area of 350 W/m2. Of this incident light, only about 40% is usefulfor photosynthesis. (a) If the process was perfectly efficient (i.e. all the useful radiation was converted tostored internal energy), calculate the increase in internal energy of the leaf in aperiod of one hour. (b) In practice, the overall efficiency of the process (percentage of energy storedrelative to the total incident energy reaching the surface of the leaf) is only about6%. Discuss, in relation to the First Law of Thermodynamics, what happens to theremaining energy?