A charged particle having drift velocity of 7.5× 10^-4 m/s in an electric field of 3×10^-10V/m, has mobility in m^2 V^-1 s^-1

 [NEET-2020 ] a. 2.25×10^15      b. 25×10^6      c. 2.5×19^-6        d. 2.25 ×10^-15

LIGHT WITH AN AVERAGE FLUX OF 20 W/m^2 FALLS ON A NON-REFLECTING SURFACE AT NORMAL INCIDENCE HAVING SURFACE AREA 20 m^2. THE ENERGY RECEIVED BY THE SURFACE DURING TIME SPAN OF 1 MINUTE IS :

                             

THE ENERGY EQUIVALENT OF 0.5g OF A SUBSTANCE IS ?

[NEET 2020]  (a) 4.5 × 10 16 J (b) 4.5 × 10 13 J (c) 1.5 × 10 13 J (d) 0.5 × 10 13 J