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Lerok [7]
3 years ago
7

Please need some help thank you

Physics
1 answer:
ollegr [7]3 years ago
3 0
<span>Under velocity would be, change in displacement over change in time, and units m/s. Under acceleration would be, Change in velocity over change in time, and units m/s^2. Under Both would be rate of change and can be positive or negative.</span>
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Plain electromagnetic wave (in air) has a frequency of 1 MHz and its B-field amplitude is 9 nT a. What is the wavelength in air?
Norma-Jean [14]

Answer:

Part a)

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Part b)

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Part c)

I = 9.68 \times 10^{-3} W/m^2

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Explanation:

Part a)

As we know that frequency = 1 MHz

speed of electromagnetic wave is same as speed of light

So the wavelength is given as

\lambda = \frac{c}{f}

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Part b)

As we know the relation between electric field and magnetic field

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Part c)

Intensity of wave is given as

I = \frac{1}{2}\epsilon_0E^2c

I = \frac{1}{2}(8.85 \times 10^{-12})(2.7)^2(3\times 10^8)

I = 9.68 \times 10^{-3} W/m^2

Pressure is defined as ratio of intensity and speed

P = \frac{I}{c} = \frac{9.68\times 10^{-3}}{3\times 10^8}

P = 3.22 \times 10^{-11} N/m^2

6 0
3 years ago
Write one example of a physical change and one example chemical change
mojhsa [17]
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Chemical change = changes the chemical properties into an entire new chemical form
Examples of physical change would be melting ice cubes or sugar cubes.
Examples of chemical change would be cooking eggs or burning paper because you're changing its chemical properties.
6 0
3 years ago
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