2 4binding energy per nucleon 41H &2 He r 1.1 Me V & 7MeV respectively den d energy released when 2 1H2 nulei fuse 2 form a 2He4 is ans is -2.8 MeVD frequencyof revolution in nth orbit of Bohr model of an atom is fn den d variation of log(fn/f1) wid log (n) can b qualitatively represented as(draw d graph 4 it plz giv d explanation 4 it)d ball of mass m falls vertically from a height h & collides wid a block of equal mass m which is moving horizontally on a horizontal surface , velocity of d block at d instant of collision is u. coefficient of friction btwd block & d horizontal surface is =0.2 & d coefficient of restitution is 0.5 den d velocity of d block decreases bya) 0 b)0.3 rt(2gh) c) 2 rt(2gh) d) u2 identical positiv charges r fixed on d Y-axis at equal distances from d origin O a negativly charged particle starts on d -ve X-axis at a large distance from O moves along d X-axis passes thru O & goes far away from origin 2wards +ve X-axis amgnitude of d acceleration a due 2 +ve charges is plotted as a function of its +ve coordinate x as(draw d graph btw 'a' on Y-axis & x on X -axis)

Aditi Chauhan , 10 Years ago

Grade 10