In Q12 -17, consider a 1.2m long fluorescent tube with 120V (mains) between the

Question

In Q12 -17, consider a 1.2m long fluorescent tube with 120V (mains) between the cathode and anode (the 2 ends).

If an electron leaves the cathode at rest and goes all the way to the anode without bumping into anything, what is its KE at the anode?

Question 12 options:

7.5 E20 J

1.9 E-17 J

1.3 E-21 J

2.3 E-15 J

E.) None of the above

Question 13 options:

4.2 E13 m/s

1.5 E5 m/s

2.7 E10 m/s

6.5 E7 m/s

None of the above

A)

7.5 E20 J

B)

1.9 E-17 J

C)

1.3 E-21 J

D)

2.3 E-15 J

E.) None of the above

Question 13 options:

A)

4.2 E13 m/s

B)

1.5 E5 m/s

C)

2.7 E10 m/s

D)

6.5 E7 m/s

E)

None of the above

Explanation / Answer

workdone=kinetic energy

W=VQ=KE

=120V(1.6*10^-19C)

=1.9*10^-17J

Option(B)

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