Billions of years ago the scale factor, R, was half of what it is now. How did the density of matter at that point in time compare to the density of matter now?

Q: Find the number of ways of putting 3 particles in 5 boxes according to the three kinds of…

A: 3 particles in 5 boxes

Q: I'm having trouble understanding this.   Suppose we have a spaceship about the size of a typical…

A: The mass of the ship is M = 130 million kilograms = 1.3×108 kg The required velocity is 12 % of the…

Q: hich statement is most logical?  a Thermal temperature is released in form of photons to slow down…

A: Solution: The ideal gas equation gives the relationship between the pressure-volume and temperature.…

Q: What is the bell jar experiment?

A:

Q: What are the flaws of Plum Pudding Model?

A: Answer:-  The flaws of Plum Pudding Model :-  The Thomson's Plum Pudding Model was given up as it…

Q: What is the densest substance in the universe?

A: Osmium is the densest thing in the universe.

Q: A paradox is defined in the Merriam-Webster online dictionary as 'an argument that apparently…

A: Special theory of relativity

Q: 7:40 M l 89%É 3:45 * E F all 66% A edugen.wileyplus.com/edugen/ WileyPLUS MywyPus I Hlp I Cartact…

A: (given) Mass (m) of the rolller coaster = 1200 kg Speed of the wheel = 7.6 m/s Radius of the hill =…

Q: Pin Hole (0) 1m 0.3m 2m бт *not to scale

A: For blue line  Let vertical distance on wall is a  Now,  By symmetric triangle  a/(6+2) = 1/2  a = 4…

Q: Why do we use half the length of the meter stick?

A:

Q: What are the characteristics of Plum Pudding Model?

A: The plum pudding model is defined by electrons surrounded by a volume of positive charge, like…

Q: The present number density of electrons in the Universe is the same as that of protons, about 0.2…

A: The present number density of electrons = 0.2m-3. Long before the formation of microwave background,…

Q: When the universe was approximately one second old its size grew by a factor of 10 to the power of…

A: When the universe was approximately one second old its size grew by a factor of 10 to the power of…

Q: Where did all the antimatter go?

A: Anti-particle came into light in the 20th century when famous physicist Paul Dirac was trying to…

Q: A radio transmitter broadcasts at a frequency of 119kHz. What is the wavelength of the wave? ( speed…

A: Given, The frequency of the broadcast signal is, f = 119 kHz = 119×103 Hz speed of the light in the…

Q: If a space ship traveling at 1/5 the speed of light travels to a star system 6 light years away How…

A: Speed of spacecraft is ; here  is speed of light.Distance is Note:Speed of light is Find:Time taken…

Q: Suppose we live in a universe in which the electron and positron have charges opposite to ours, i.e.…

A: Electron:- Subatomic particles known as electrons have an elementary charge of magnitude -1.  A…

Q: Consider three periods in the history of the Universe: one million years after the Big Bang (age = 1…

A: In early times, the Universe was expanding at a rapid pace. Then, the rate of expansion of the…

Q: We receive today the light from a distant galaxy and from its spectrum we conclude that it took 400…

A: Option c is correct That galaxy is moving away from us, so today it is more distant form us than 400…

Q: Why do we think that nothing, other than light, can travel faster than the speed of light?

A: According to the Einstein’s theory of relativity nothing can travel faster than light.

Q: Explain the Higher-Order Systems?

A:

Q: Why couldn't atomic nuclei exist when the age of the universe was less than 2 minutes?

A: As per Hubble's theory, the universe is expanding, this means at some point in time there were…

Q: write a note of 1000 words on semi classical physics?

A: Introduction: Semiclassical physics refers to the theory in which one part of the system is…

Q: Why don’t we notice length contraction in everyday life?

A: This is a question from relativity.  Length Contraction: This is the phenomenon in which a moving…