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jasenka [17]
4 years ago
7

With what speed do the electrons strike the screen? Hint: The kinetic energy of an electron which has been accelerated through a

potential difference of 1 V has a kinetic energy equal to 1 eV.
Physics
1 answer:
stich3 [128]4 years ago
5 0

Answer: 3.5 X 10^11 m/s

Explanation:

1 eV is the amount of energy associated with moving one electron through a potential difference of 1 volt.

1 eV = 1.6 x 10-19 J

Mass of electron=9.11 × 10-31

K.E =MV^2/2

V=√(2K.E/M)

V=3.5 X 10^11

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  • Ø=37°
  • Initial velocity=u=20m/s
  • g=10m/s²

#A

\\ \rm\Rrightarrow H_{max}=\dfrac{u^2sin^2\theta}{2g}

\\ \rm\Rrightarrow H_{max}=\dfrac{20^2(sin37)^2}{2(10)}

\\ \rm\Rrightarrow H_{max}=\dfrac{400sin^237}{20}

\\ \rm\Rrightarrow H_{max}=20sin^237

\\ \rm\Rrightarrow H_{max}=7.2m

#B

\\ \rm\Rrightarrow R=\dfrac{u^2sin2\theta}{g}

\\ \rm\Rrightarrow R=\dfrac{20^2sin74}{10}

\\ \rm\Rrightarrow R=40sin74

\\ \rm\Rrightarrow R=38.5m

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\\ \rm\Rrightarrow T=\dfrac{2usin\theta}{g}

\\ \rm\Rrightarrow T=\dfrac{2(20)sin37}{10}

\\ \rm\Rrightarrow T=4sin37

\\ \rm\Rrightarrow T=2.4s

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\\ \rm\Rrightarrow v=u-gt

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\\ \rm\Rrightarrow v=20-24

\\ \rm\Rrightarrow v=-4m/s

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