Answer:
a ) 2.13 X 10⁶ m/s .
b ) 1.28 X 10⁶ m/s
Explanation:
When electrons are repelled by negative plates and attracted by positive plates , it will increase their kinetic energy.
Increase in their energy = 4.15 eV
= 4.5 X 1.6 X 10⁻¹⁹ J
= 6.64 x 10⁻¹⁹ J
Initial kinetic energy
= 1/2 mv²
= 1/2 x 9.1 x 10⁻³¹ x ( 1.76 x 10⁶)²
= 14.09 X 10⁻¹⁹ J
Total energy
= 6.64 x 10⁻¹⁹+14.09 X 10⁻¹⁹
= 20.73 x 10⁻¹⁹
If V be the increased velocity
1/2 m V² = 20.73 X 10⁻¹⁹
.5 X 9.1 X 10⁻³¹ V² = 20.73 X 10⁻¹⁹
V = 2.13 X 10⁶ m/s .
b ) When electrons are released from positive plate , their speed are reduced because of attraction between electrons and positively charge plates.
Initial kinetic energy
= 14.09 x 10⁻¹⁹ J (see above )
reduction in kinetic energy
= 6.64 x 10⁻¹⁹ J ( See above )
Total energy with electron -
= 14.09 x 10⁻¹⁹ - 6.64 x 10⁻¹⁹
= 7. 45 x 10⁻¹⁹ J .
If V be the energy of electrons reaching the negative plate,
1/2 m V² =7. 45 x 10⁻¹⁹
V = 1.28 X 10⁶ ms⁻¹
Power is the rate at which work is being done.
Answer:FALSE
Explanation: The Central message of a poem is the Theme of the poem, the poem is a poetry done to pass a particular message which may be regarding the present predicament of the people or to entertain. The poem the Desert Run was written in the year 1988 it was meant to express DISCRIMINATION AND HOPE. The poem was written by Mitsuye Yamada an activist of women rights and a Japanese National who lives in Seattle, Washington.
Answer:
the law of conservation of electric charge that states that electric charge cannot be created or destroyed, it can only be exchanged between bodies.
Explanation:
In physics there are several conservation laws that are of great importance, among them we have the law of conservation of electric charge that states that electric charge cannot be created or destroyed, it can only be exchanged between bodies.
In general, the Earth is a very large body and is considered a reservoir where the electrical charge can be stored, but cannot be destroyed.
