An electron moving at a speed of 5× 106ms-1 is shot through a sheet of paper which is 2.1× 10-4cm thick. The electron emerges from the paper with speed of 2× 106ms-1. The rime taken by the electron in a second to pass through the paper sheet is

Question

An electron moving at a speed of 5× 106ms-1 is shot through a sheet of paper which is 2.1× 10-4cm thick. The electron emerges from the paper with speed of 2× 106ms-1. The rime taken by the electron in a second to pass through the paper sheet is (A)  5× 10-12  (B)  6× 10-13  (C)  3× 10-12  (D)  5× 10-13

Tardigrade Admin · Accepted Answer

(i) The collision is said to be elastic when the kinetic energy is conserved. (ii) Linear momentum is conserved in all types of collision (iii) Angular momentum of a system remain constant if resultant torque acting on it is equal to zero. As L=Iω , so if vecτ =0 then Iω =cons tan t (iv) In all physical process the total energy is conserved. So, option is correct.

Q. An electron moving at a speed of $5 \times 10^{6} m s^{- 1}$ is shot through a sheet of paper which is $2.1 \times 10^{- 4} c m$ thick. The electron emerges from the paper with speed of $2 \times 10^{6} m s^{- 1} .$ The rime taken by the electron in a second to pass through the paper sheet is

$5 \times 10^{- 12}$

$6 \times 10^{- 13}$

$3 \times 10^{- 12}$

$5 \times 10^{- 13}$

Q. An electron moving at a speed of 5×106ms−1 is shot through a sheet of paper which is 2.1×10−4cm thick. The electron emerges from the paper with speed of 2×106ms−1. The rime taken by the electron in a second to pass through the paper sheet is

5×10−12

6×10−13

3×10−12

5×10−13

Q. An electron moving at a speed of $5 \times 10^{6} m s^{- 1}$ is shot through a sheet of paper which is $2.1 \times 10^{- 4} c m$ thick. The electron emerges from the paper with speed of $2 \times 10^{6} m s^{- 1} .$ The rime taken by the electron in a second to pass through the paper sheet is

$5 \times 10^{- 12}$

$6 \times 10^{- 13}$

$3 \times 10^{- 12}$

$5 \times 10^{- 13}$