Questions from Modern Physics

Q: In an experiment done in a laboratory on the earth, the

In an experiment done in a laboratory on the earth, the wavelength of light emitted by a hydrogen atom in the n = 4 to n = 2 transition is 486.1 nm. In the light emitted by the quasar 3C273 (see Probl...

Q: A galaxy in the constellation Pisces is 5210 Mly from the earth

A galaxy in the constellation Pisces is 5210 Mly from the earth. a. Use the Hubble law to calculate the speed at which this galaxy is receding from earth. b. What redshifted ratio λ0/λS is expected...

Q: The definition of the redshift z is given in Example 44.

The definition of the redshift z is given in Example 44.8. a. Show that Eq. (44.13) can be written as 1 + z =([1 + β]/[1 – β])1/2 , where β = v/c...

Q: Calculate the reaction energy Q (in MeV) for the reaction

Calculate the reaction energy Q (in MeV) for the reaction e- + p → n + ve. Is this reaction endoergic or exoergic?

Q: Calculate the energy (in MeV) released in the triple alpha

Calculate the energy (in MeV) released in the triple alpha process 3 4He → 12C.

Q: The 2.728-K blackbody radiation has its peak wavelength

The 2.728-K blackbody radiation has its peak wavelength at 1.062 mm. What was the peak wavelength at t = 700,000 y when the temperature was 3000 K?

Q: Calculate the reaction energy Q (in MeV) for the nucleosynthesis

Calculate the reaction energy Q (in MeV) for the nucleosynthesis reaction 6 12

Q: In classical (Newtonian) mechanics, the total energy E of

In classical (Newtonian) mechanics, the total energy E of a particle can never be less than the potential energy U because the kinetic energy K cannot be negative. Yet in barrier tunneling (see Sectio...

Q: A proton and an antiproton annihilate, producing two photons. Find

A proton and an antiproton annihilate, producing two photons. Find the energy, frequency, and wavelength of each photon a. if the p and p are initially at rest and b. if the p and p collide head-on,...

Q: For the nuclear reaction given in Eq. (44.2

For the nuclear reaction given in Eq. (44.2) assume that the initial kinetic energy and momentum of the reacting particles are negligible. Calculate the speed of the α particle immediately after it le...