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4 years ago

14

The main difference between speed and velocity involves

2 answers:

ad-work [718]4 years ago

7 0

D. Direction, if someone is traveling on an interstate from New York to Boston at 65 MPH, the speed of the car is 65 MPH and the velocity is 65 MPH north-east.

inn [45]4 years ago

3 0

Speed does not include direction.
Velocity includes direction.

Therefore, the main difference between speed and velocity is D. Direction.

FINAL ANSWER: D. direction

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Derive an expression for the de Broglie wavelength of a thermal neutron and calculate its value at the temperature T = 290 K. Th

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Answer:

1.479 A

Explanation:

Expression for de Broglie wave length

λ = $\frac{h}{\left ( 2mKE \right )^{.5}}$

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Kinetic Energy ( KE) = 3 / 2 kT

=1.5 X 1.38 X 10⁻²³ X 290 = 600.3 X 10⁻²³ J

$\sqrt{2mKE}$ = $\sqrt{2\times1.67\times10^{-27}\times600.3\times10^{-23}}$

44.777 x 10⁻²⁵

λ = $\frac{6.626\times10^{-34}}{44.777\times10^{-25}}$

=1.479 A.

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