Which of these is not an example of a physical change?

Physics

2 answers:

horsena [70]3 years ago

5 0

A. a nail rusting is not a physical change its a chemical change

amm18123 years ago

3 0

A nail rusting is an example of chemical change as the iron is oxidized to become rust. This is not a physical change.

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what is the frequency of the photon emitted by a hydrogen atom when its electron drops from the n = 6 to n = 4 energy level?

Gemiola [76]

The frequency of the photon emitted by a hydrogen atom is $26.2*10^-^4 hz$

<h3>What are Photons?</h3>

A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass.

In the case of light, the frequency, symbolized by the Greek letter nu (ν), of any wave equals the speed of light, c, divided by the wavelength λ:

v = c/λ

Since the wavelength λ is in the bottom of the fraction, the frequency is inversely proportional to the wavelength.

v = c/λ

v= $\frac{3*10^8}{434*10^-^9} = 6.91*10^1^4 Hz$

By using Rydberg's formula,

1/λ $= Rz^2(\frac{1}{n_1^2} - \frac{1}{n_2^2})$

1/λ = $109677 *(\frac{1}{4^2} - \frac{1}{6^2}) = 3808.22 cm^-^1$

λ = $26.2*10^-^4 hz$

$26.2*10^-^4 hz$ is frequency of the photon emitted by a hydrogen atom.

Learn more about Photons here:brainly.com/question/20912241

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4 0

1 year ago

A 1500 kg car has an applied forward force of 5000 N and experiences an air resistance of 1250 N. What is the car's acceleration

marshall27 [118]

Answer:

$2.33\ m/s^2$

Explanation:

<u>Net Force </u>

According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:

Fn = m.a

Where a is the acceleration of the object. The net force is the sum of the individual vector forces applied to the object.

The m=1500 Kg car has two horizontal forces applied: the forward force of 5000 N that causes the movement and the air resistance force of 1250 N that opposes motion.

The net force is Fn = 5000 N - 1500 N = 3500 N

To find the acceleration, we solve the equation for a:

$\displaystyle a=\frac{Fn}{m}$