Question

2. The charge of an electron is 1.6 x 10-19 C. How many
electrons strike the screen of a cathode ray tube each
second when the beam current is 16 MA?
(d) 5 C
(c) 18 C
(a) 107
(C) 10-19
(b) 1019
(d) 10-17
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Answer 1

Answer:

the answer is ( c) = 10^ -19.

Explanation:

charge on electron (Q) = 1.6×10^-19 c.

the current of beam ( I) = 16 MA.

= 16 × 10^ 3A.

since , 1 MA = 10^ 3 A.

then, 16 MA = 16× 10^3A.

now,

Q = I/ T.

T = I/ Q

T = 16×10^3/1.6×10^-19

T = 1× 10^-7 or 10^-7.