Efficiency of a Carnot engine is 50% when temperature of sink is 500K. In order
Efficiency of a Carnot engine is 50% when temperature of sink is 500K. In order to increase efficiency up to…
8 years ago
Physics
A Carnot engine takes heat from a reservoir at 627⁰C and rejects heat
A Carnot engine takes heat from a reservoir at 627⁰C and rejects heat to a sink at 27⁰C. Its efficiency…
8 years ago
Two thin lenses when placed in contact, then the power of combination is +10 D.
Two thin lenses when placed in contact, then the power of combination is +10 D. If they are kept 0.25…
8 years ago
The mirrors are inclined at an angle of 50⁰. The number of images formed for an object
The mirrors are inclined at an angle of 50⁰. The number of images formed for an object placed in between…
8 years ago
An α-particle of energy 5 MeV is scattered through 180⁰ by a fixed uranium nucleus.
An α-particle of energy 5 MeV is scattered through 180⁰ by a fixed uranium nucleus. The distance of the closest…
8 years ago
The half-life of radioactive element is 600 yr. The fraction of sample
The half-life of radioactive element is 600 yr. The fraction of sample that would remain after 3000 yr is Options…
8 years ago
If the terminal speed of a sphere of gold (density=19.5 kg/m³) is 0.2 m/s
If the terminal speed of a sphere of gold (density=19.5 kg/m³) is 0.2 m/s in a viscous liquid (density=1.5 kg/m³)…
8 years ago
A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹.
A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹. When its temperature…
8 years ago
The maximum velocity of a particle, executing simple harmonic motion with an amplitude
The maximum velocity of a particle, executing simple harmonic motion with an amplitude 7 mm, is 4.4 m/s. The period…
8 years ago
When a mass m is attached to a spring, it normally extends by 0.2 m.
When a mass m is attached to a spring, it normally extends by 0.2 m. The mass m is given…
8 years ago