000

Identify the particle X in the following decay. (Hint - Use lepton number conservation) ut - e+ + v e +X O V Ov O VA block of mass 10 kg is attached to a spring of spring constant 1000 N/m. Block is pulled by 15 cm downwards (Point A) from its equilibrium position and released. In case 1) block now performs a SHM. In case 2) spring is cut when it was at its natural length and the block was moving upwards (during SHM). Find the difference of time taken by the block reaches to point A in case 1 and case 2. (Take g = 10 m/s/s) 0.35 sec 0 sec 0.04 sec 0.19 secMr. A is going to a hill station with his family by driving a car. When the car approaches the hill, he shifts from high gear to low gear. He does this because to increase the force pushing the car forward. O Both (A) and (B) are correct. to increase the power output from the tires. O Neither (A) nor (B) is correctA body is at 75 degrees and cools in the surroundings at 25 degrees. At what temperature will its rate of cooling be half that at the beginning? 25 degrees 60 degrees 50 degrees 37.5 degreesWhat is the momentum of a proton moving at a speed v = 0.92c. O 2205 MeV/c O 1105 MeV/c O 3055 MeV/c O 4410 MeV/cA special kind of jet is shot in the water. If the jet is going with acceleration 2 m/s/s. What is the pressure on the jet when it is 50 m deep from the surface? (Assume the pressure at water surface = 1 atm). 4.9 atm 1 atm 2 atm 5.9 atmThe width of a spectral line of wavelength 300 nm is measured as 0.01 nm. What is the average time that the system remains in the corresponding energy state? 0.15 femtosecond 4.7 picosecond 0.47 second 0.015 millisecondA diffraction grating is illuminated by a monochromatic light of wavelength 660 nm. What is the number of lines per cm on the grating so that only two maxima are produced? O 15000 O 7500 O 3000 O 5000