The critical density of the universe

Assignment Help Physics

Reference no: EM13540215

The critical density of the universe is 5.80×10^?27 kg/m^3

A) Assuming that the universe is all hydrogen, express the critical density in the number of H atoms per cubic meter.

B) If the density of the universe is equal to the critical density, how many atoms, on the average, would you expect to find in a room of dimensions 4.80m*9.00m*3.60 ?

C) Find the number of atoms in the room in part (B) under normal conditions on the earth.

Reference no: EM13540215

Questions Cloud

How long does it take for sunlight to reach jupiter : The distance to a star is approximately 7.60 1018 m. If this star were to burn out today, in how many years would we see it disappear? How long does it take for sunlight to reach Jupiter?

Rms output voltage of the transformer : A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 9:72. When used with 120 V (rms) household service, the transformer draws an rms current of..

What is the most constructively reflected wavelenth : An oil slick on water is 120nm thick and illuminated by white light incident perpendicular to its surface. What color does the oil appear (what is the most constructively reflected wavelenth), given its index of refraction is 1.40?

What are the energies of the emitted radiations : An electron is in the n=5 state of hydrogen. To what states can the electron make transitions and what are the energies of the emitted radiations?

The critical density of the universe : The critical density of the universe is 5.80×10^?27 kg/m^3. Assuming that the universe is all hydrogen, express the critical density in the number of H atoms per cubic meter.

Minimum distance between alpha particles and gold nucleus : Alpha particles of kinetic energy 5.00 MeV are scattered at 90 degrees by a gold foil. What is the impact parameter? What is the minimum distance between alpha particles and gold nucleus?

Wavelengths permitted for the electrons de broglie waves : An electron is trapped in an infinite well of width 0.120 nm. What are the three longest wavelengths permitted for the electron's de Broglie waves?

Determine the kinetic energy of the electron in joules : Determine the kinetic energy of the electron in joules

What is the angular speed of the wheel : An early method of measuring the speed of light makes use of a rotating slotted wheel. A beam of light passes through a slot at the outside edge of the wheel, as in Fig. 10-31, travels to a distant mirror, and returns to the wheel just in time to ..

User Account

All Pages