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3 years ago

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Physics

1 answer:

nevsk [136]3 years ago

7 0

Answer:

Its ok but the answer is C

Explanation:

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A 477 g portion of soup is heated in a microwave oven from 25°C to 90°C, using radiation with a wavelength of 1.55 × 10⁻² m. Ass

zheka24 [161]

To solve this problem we will use the heat transfer equations, to determine the amount of heat added to the body. Subsequently, through the energy ratio given by Plank, we will calculate the energy of each of the photons. The relationship between total energy and unit energy will allow us to determine the number of photons

The mass of water in the soup is 477g

The change in temperate is

$\Delta T = (90+273K)-(25+273K) = 65K$

Use the following equation to calculate the heat required to raise the temperature:

$q = mc\Delta T$

Here,

m = Mass

c = Specific Heat

$q = (477)(4.184)(65)$

$q = 129724.92J$

The wavelength of the ration used for heating is $1.55*10^{-2}m$

The number of photons required is the rate between the total energy and the energy of each proton, then

$\text{Number of photons} = \frac{\text{Total Energy}}{\text{Energy of one Photon}}$

This energy of the photon is given by the Planck's equation which say:

$E = \frac{hc}{\lambda}$

Here,

h = Plank's Constant

c = Velocity of light

$\lambda =$ Wavelength

Replacing,

$E = \frac{(6.626*10^{-34})(3*10^8)}{1.55*10^{-2}}$

$E = 1.28*10^{-23}J$

Now replacing we have,

$\text{Number of photons} = \frac{82240.7}{1.28*10^{-23}}$

$\text{Number of photons} = 6.41*10^{27}$

Therefore the number of photons required for heating is $6.41*10^{27}$

4 0

3 years ago

Using information about natural laws, explain why some car crashes produce minor injuries and others produce catastrophic injuri

ch4aika [34]

The larger the mass the mass and the speed, the larger the force it would produce if it crashes something. Some car crashes produce minor injuries because maybe this car is small and runs at very slow speed which would mean less force when in impact with another. However, if a big truck crashes, it is expected to produce a larger force causing catastrophic injuries.

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3 years ago

Which of the following statements about Ohm's Law is true? A. Increasing the voltage decreases current. B. Keeping the same volt

ankoles [38]

'D' is one way to increase the current. Another way is to increase the voltage. / / / It's possible that 'C' might also be a true statement. We don't know; because we can't see it.

5 0

3 years ago

An electromagnetic wave has a wavelength of 1.5x10⁻⁵ m. What is its frequency?

OLga [1]

Answer:2x10^13Hz

Expllanation:In the space, c=3x10^8m/s
c=λf
f=c/λ=(3x10^8m/s)/(1.5x10^(-5)m)=2x10^13Hz

4 0

2 years ago

Read 2 more answers

I need all the answers to all of them today cause I have to give it in tomorrow

bonufazy [111]

6. c

7. g

8. f

9. b

10. a

11. d

12. e

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3 years ago