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Hubble constant; H0 (E.P. Hubble; 1925):
The constant that determines the relationship among the distance to a galaxy and its velocity of recession because of the expansion of the Universe. As the Universe is self-gravitating, it is not constant truly. In cosmology, it is described as
H = (da/dt)/a,
where a refer to the 4-radius of the Universe. While evaluated for the present, it is written
H0 == H(t = now).
The Hubble constant is not known to great correctness (only about a factor of 2), however is supposed to lie somewhere among 50 and 100 km/s/Mpc.
Transistor: An active semi-conductor device with three terminals that is emitter base and collector is known as transistor. Types of Transistor: There are two types of
What is the Principal value branch of i i Ans) Principal value branch of ii=e-π/2
What is waveguide dispersion in optical fibres? Waveguide dispersion (Δτ w ): Waveguide dispersion occurs because of the dependence onto the velocity of propagation of every
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(a) Explain the term 'capacitance' of a capacitor. Derive an expression for the total Capacitance of 'n' capacitors arranged in series. (b) Explain the term 'capacitance' of
An ideal Brayton cycle uses air as a working fluid. The air enters the compressor at 101 kpa and 37 C. The pressure ratio of the compressor is 12:1, and the temperature of the air
A 350-Hz tuning fork is held over the end of a pipe that is inserted into water. What is the spacing between the resonance lengths of the pipe if the speed of sound is 348 m/s
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Magnification is the ratio of size of image to the size of object. hence it is a dimensionless constant. It has no units. 1/m is not its unit.(1/m is the unit of power=DIOPTRE)
The neutrons and protons in a stable nucleus are held together by nuclear forces and energy is required to pull them infinitely apart (or the similar energy is released during the
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