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A high contrast image and a dark image will have what kind of histogram respectively, when the histogram, h(rk) = nk, rk the kth gray level and nk total pixels with gray level rk, is plotted nk versus rk? The histogram that are concentrated on the dark side of gray scale. The histogram whose component are biased toward high side of gray scale. The histogram that is narrow and centered toward the middle of gray scale. The histogram that covers wide range of gray scale and the distribution of pixel is approximately uniform.
Consider the given statements and decide which of the conclusions logically follow follow from the statements. Statement: All laptops are electronics. All electronics emit radiation. Conclusions: 1. All laptops emit radiation. 2. Some radiation is due to electronics.
All the forms of matter except gases emit electromagnetic radiation continuously. The gases which electrically or thermally excited emit a certain wavelength only, then which of the following is/are true about the process (i) The spacing between the atoms in the other forms of matter is high than in gas (ii) The spacing between the atoms in gases is high than the other forms of matter (iii) The energy of the emitted radiation depends on the spacing between the atoms (iv) The wavelength of the emitted radiation depends on the spacing between the atoms 
A contrast stretching result been obtained by setting (r1, s1) = (rmin, 0) and (r2, s2) = (rmax, L – 1), where, r and s are gray-values of image before and after processing respectively, L is the max gray value allowed and rmax and rmin are maximum and minimum gray-values in image respectively. What should we term the transformation function if r1 = r2 = m, some mean gray-value.
Consider an enclosure formed by three surfaces having the following values of shape factors, emissivities and temperatures Surface 1 i.e. curved cylindrical has an emissivity 0.75 and temperature 800 K Surface 2 i.e. closing disc has an emissivity 0.8 and temperature 700 K Surface 3 i.e. closing disc has an emissivity 0.8 and temperature 700 K The closing flat discs are 25 mm in diameter and they have interspacing distance equal to 100 mm. If the shape factor between these two identical discs is 0.05, calculate the net rate of radiant heat flow from the curve surface to each of the closing end surface
Two large parallel planes with emissivity 0.4 are maintained at different temperatures and exchange heat only by radiation. What percentage change in net radiative heat transfer would occur if two equally large radiation shields with surface emissivity 0.04 are introduced in parallel to the plates?
A gray body (E = 0.8) emits the same amount of heat as a black body at 1075 K. Find out the required temperature of the gray body
In the table, production and sale (in 1000 tonnes) of a certain product of a company over 5 years is given. Study the table and answer the question. Years Production (in 1000 tonnes) Sale (in 1000 tonnes) 2015 1250 1000 2016 1400 1290 2017 1450 1100 2018 1500 1450 2019 1600 1390 In which year(s) sale is 80% or more but less than 90% of the production?
Study the table and answer the question In the table, production and sale (in 1000 tonnes) of a certain product of a company over 5 years is given. Years Production (in 1000 tonnes) Sale (in 1000 tonnes) 2015 1250 1000 2016 1400 1290 2017 1450 1100 2018 1500 1450 2019 1600 1390   In which year(s) sale is more than 90% of the production?
In the table, production and sale (in 1000 tonnes) of a certain product of a company over 5 years is given. Study the table and answer the question:  Years  Production (in 1000 tonnes)  Sale (in 1000 tonnes)  2015  1250  1000  2016  1400  1290  2017  1450  1100  2018  1500  1450  2019  1600  1390 In which year(s) the sale increases by more than 25% of the previous year?