NEET Physics: Questions 1906 - 1908 of 2142

The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are V, V _s and V _O, then the apparent frequency heard by the observer will be,

Two satellites S ₁ and S ₂ revolve round a planet in the same direction in circular orbits. Their periods of revolutions are 1 hour and 6 hour respectively. The radius of S ₁ is 1.5 ⨯ 10 ⁵ km and the radius of S ₂ is 4.95 ⨯ 10 ⁵ km. The velocity of S ₂ with respect to S ₁ is . The angular velocity of S ₂ as actually observed by an astronaut in S ₁ is –

In an experiment to determine an unknown resistance, a 100 cm long resistance wire is used. The unknown resistance is kept in the left gap and a known resistance is put into the right gap. The scale used to measure length has a least count 1 mm. The null point B is obtained at 40.0 cm from the left gap. Determine the percentage error in the computation of unknown resistance.