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Feliz [49]
3 years ago
14

Show by derivation that P=K÷(V_P)​

Mathematics
1 answer:
kolbaska11 [484]3 years ago
8 0

Answer:

ω is the angular velocity given by ω=2πf

k is the angular wave number given by – k=2πλ

t is time

x be the position

Vp phase velocity

Vg be the group velocity

The phase velocity of a wave is given by the following equation:

vp=ωk…..(eqn 1)

Rewritting the above equation, we get:

ω=kvp…..(eqn 2)

Differentiating (eqn 2) w.r.t k we obtain,

dwdk=vp+kdvpdk…..(eqn 3)

As vg=dwdk, (eqn 3) reduces to:

vg=vp+kdvpdk

The above equation signifies the relationship between the phase velocity and the group velocity.

Hope you understood the relation between group velocity and phase velocity of a progressive wave.

Follow me please

Mark brainliest

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4 years ago
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3 years ago
If Janet buys a bag for $45.50 and the tax is 5% and she has $60, will she have enough money to buy a $12 movie ticket?
sertanlavr [38]

In this equation, we're trying to find if she has enough money to buy a $12 movie ticket.

We know that she buys a bag for $45.50, with a 5% tax rate. Let's calculate the total cost of the bag after tax.

45.50 · 1.05 = 47.775

Round to the nearest hundredths place

$47.78

She spent $47.78 on the bag.

She has $60, so calculate how much money she has left.

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She has $12.22 left to spend.

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She would also have 22 cents left to spare.

Answer:

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8 0
3 years ago
Read 2 more answers
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