Physics, 29.10.2019 01:31 lasvegas5811

How much energy is required to get a hydrogen atom to excite to n = 5?

Answers: 2

Show answers

Answers

Answer from: dawsoncollins4117

$2.09\cdot 10^{-18} J$

Explanation:

The energy levels of a hydrogen atom are given by the formula

$E_n = -13.6 \frac{1}{n^2}$ [eV]

where n is the number of the level.

Therefore, the energy of the ground state is

E_1 = -13.6 eV

While the energy of the level n = 5 is

$E_5 = -13.6 \frac{1}{5^2}=-0.54 eV$

So, the energy that a hydrogen atom needs to excite from n = 1 to n = 5 is

$\Delta E = E_5 - E_1 = -0.54-(-13.6)=13.06 eV$

And converting into Joules,

$\Delta E = 13.06 \cdot (1.6\cdot 10^{-19})=2.09\cdot 10^{-18} J$

Answer from: Quest

the unit of the measure = $\frac{j}{kgk}$

explanation:

the property that is quantified by the energy needed per of material to raise the temperature by one.

si unit of energy = joule (j)

si unit of temperature = kelvin (k)

si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is $\frac{j}{kgk}$

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Another question on Physics

Physics, 22.06.2019 04:30

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Answers: 1

Answer

Physics, 22.06.2019 05:10

Which best represents the law of conservation of mass ?

Answers: 3

Answer

Physics, 22.06.2019 08:00

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

Answers: 3

Answer

Physics, 22.06.2019 11:00

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide? kg • what must the total momentum of the system be after the train cars collide? kg •