PHYSICS HIGH SCHOOL

A blue-light photon has a wavelength of 4.80 × 10-7 meter. What is the energy of the photon?

Answers

Answer 1

Answer:

Answer:

$Energy = 4.125 * 10^(-19) J$

$Energy = 2.6 eV$

Explanation:

As we know that energy associated with a photon is given by

$Energy = (hc)/(\lambda)$

here we know that

$h = 6.6 * 10^(-34)$

c = speed of light

now we have

$\lambda = 4.80 * 10^(-7) m$

now we will have

$E = ((6.6 * 10^(-34))(3 * 10^8))/(4.80 * 10^(-7))$

$E = 4.125 * 10^(-19) J$

now we can also convert it into electron volt

$E = (4.125 * 10^(-19))/(1.6 * 10^(-19)) = 2.6 eV$

Answer 2

Answer:

The energy of a photon is presented in the equation of E = hc/gamma where E is the energy of the photon, hc is 1.99x10^-25 joules – meter and gamma is the wavelength of the photon. Since you are given a blue-light photon with a wavelength of 4.80 × 10-7 meter, plug in the values to the energy equation and you will get 4.15x10^-19 joules.

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a train travels 150 km in the same time that a plane travels 400 km. if the rate of the plane is 20 km per hour less than three times the rate of the train, find both rates

Answers

Answer:

Speed of train = 60 km/hr

Speed of plane = 160 km/hr

Explanation:

We can construct the following equations from the given information:

Speed of train * time = 150 -Equation 1

Speed of plane * time = 400 -Equation 2

Speed of plane = (3 * Speed of train) - 20 -Equation 3

We can solve these three simultaneous equations for the three variables (speed of train , speed of plane, time).

Substituting within Eq. 1 and Eq. 2 we get:

Speed of plane * 150 = 400 * Speed of train -Equation 4

Finally, solving Eq. 4 and Eq. 3 simultaneously we get:

Speed of train = 60 km/hr

Speed of plane = 160 km/hr

Iron has a density of 7.9 g/cm3. What is the mass of a cube of iron with the length of one side equal to 55.0 mm?

Answers

Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. To find the mass of the substance, we need to multiply the volume occupied by the substance.

Mass = Density x Volume
Mass = 7.9 g/cm^3 (5.5 cm)^3
Mass = 43.45 g

Answer:

Mass, m = 1.31 kg

Explanation:

It is given that,

Density of iron, $d=7.9\ g/cm^3$

Side of cube, a = 55 mm = 5.5 cm

We need to find the mass of the cube of iron. Mass per unit volume is called the density of the substance. It is given by :

$d=(m)/(V)$

$d=(m)/(a^3)$

$m=d* a^3$

$m=7.9* (5.5)^3$

m = 1314.36 grams

m = 1.31 kg

So, the mass of the iron cube is 1.31 kg. Hence, this is the required solution.

Which best describes how DNA is used as a molecular clock?The number of mutations in DNA is compared between two species.
The total amount of DNA is compared between two species.
The percent of carbon in DNA is compared between parent and offspring.< The total mass of DNA is compared between parent and offspring.

Answers

The answer that best describes how DNA is used as a molecular clock is the number of mutations in DNA is compared between two species.

Answer:

The correct answer is a = The number of mutations in DNA is compared between two species.

Explanation:

Hello ! Let's solve this!

The molecular clock is a technique to see the divergence between two species. In other words, to see DNA mutations.

The correct answer is a = The number of mutations in DNA is compared between two species.

The least common shape for a galaxy is ______. irregular elliptical cluster spiral spherical

Answers

Answer: cluster

Explanation:

There are four main shapes of galaxies: spiral, galaxies are divided into four main groups: spiral, lenticular, elliptical, and irregular, elliptical, and irregular.

The least common shape is cluster

Spiral galaxies- These are the most common. These have arms extending from a bright bulge in spiral shape.

Elliptical galaxy have ellipsoidal shape.

Lenticular galaxies - Intermediate between elliptical and spiral galaxies.

Irregular shape- No well defined shape

Spherical - Nearly spherical galaxies. These are least

cluster- group of galaxies having irregular shape is the least common shape.

Question: The least common shape for a galaxy _____.

Answer:Cluster

Sound waves have two parts. The part of the wave where the particles of the medium are spread apart is called the _____. rarefaction
compression
pitch
amplitude

Answers

The answer is A) Rarefaction. Have a good day :)

Answer:

rarefaction?

Explanation:

If you increase the height from which a water droplet falls, will this change the pattern of the ripples produced?

Answers

yes because it is coming from a different height and speed

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A charge of 8.5 × 10–6 C is in an electric field that has a strength of 3.2 × 105 N/C. What is the electric force acting on the charge?