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2 years ago

Average velocity is different than average speed because calculating average velocity involves ?

Physics

2 answers:

ch4aika [34]2 years ago

7 0

Average velocity is different than average speed because calculating average velocity involves direction.

Answer: Direction

Explanation

Average speed involves taking only the magnitude in the calculation of the distance traveled and the time required whereas Average velocity takes both magnitude and direction in the calculation by taking the displacement occurred with total time.

Therefore, average speed, scalar quantity and average velocity, a vector quantity.

Scalar quantities are physical quantities considering magnitude whereas vector quantities are physical quantities considering magnitude and direction.

Studentka2010 [4]2 years ago

5 0

Direction!

Velocity is a vector quantity and speed is a scalar quantity. Vector quantities includes both magnitude and direction, while scalar quantities only have magnitude. :)

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Red light of wavelength 651 nm produces photoelectrons from a certain photoemissive material. Green light of wavelength 521 nm p

Mnenie [13.5K]

Answer:

material work function is 0.956 eV

Explanation:

given data

red wavelength 651 nm

green wavelength 521 nm

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to find out

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solution

we know by Einstein photo electric equation that is

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h ( c / λr ) = Ф + kinetic energy

for green light

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now from both equation put kinetic energy from red to green

h ( c / λg ) = Ф + 1.50 × (h ( c / λr ) - Ф)

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put all value

Ф =( 6.63 × $10^{-34}$ (3 × $10^{8}$ ) / 0.50) × ( 1.50/ λr - 1/ λg)

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Ф = 1.5305 × $10^{-19}$ J × ( 1ev / 1.6 × $10^{-19}$ J )

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