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Stefan-Boltzmann law (Stefan, L. Boltzmann):
The radiated power P (it is rate of emission of electromagnetic energy) of hot body is proportional to the radiating surface area, A, & the fourth power of the thermodynamic temperature, T. The constant of proportionality refer to the Stefan-Boltzmann constant. Mathematically specking,
P = e sigma A T4,
Where the efficiency rating e refer to the emissivity of the object.
Which of the following material has the highest melting point (A) Copper. (B) Aluminium. (C) Tungsten. (D) Gold. Ans: Tungsten has the highest melting point.
Select one membrane industrial separation application for (i) reverse osmosis (RO), (ii) ultrafiltration (UF) and (iii) microfiltration (MF) (at least one of the three (in total
A cheetah can reach a top speed of 27.8 m/s in 5.2 s. What is the cheetah's average acceleration?
A charge of 2.00x 10 -6 C is moved against a constant electric field. If 4.50 x 10 -4 J of work is done on the charge. what is the potential difference between the initial an
A flow rate of 200 gpm of oil with u=1.5 x 10 -3 lb-sec/ft2 and p=1.7 slug/ft3 occurs in a 4-in pipe. Determine the Reynolds number. Classify the flow as laminar or turbulent. Wha
The atmospheric pressure at any position is numerically similar to the weight of a column of air of unit cross-sectional area extending from that position to the top of the atmosph
What is the difference between a lens and a mirror? A mirror is a reflective surface. Light passes by the glass and hits the silver backing, reflecting off of it. (The angle of
Describe about Helium-Neon Laser in short. Helium-Neon Laser: The first gas laser termed as Helium-Neon (He-Ne) laser (one of the illustrations for four level lasers) was co
In a movie, Tarzan evades his captors by hiding underwater for many minutes while breathing through a long , thin reed . Assuming the maximum pressure difference his lungs can mana
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