The electric force of repulsion between two electrons is similar to the gravitational force: where k is called Planck's constant, q is the charge on a particle, and r is the distance separating the charges. Find the new force of repulsion between them, in terms of R: a. when the distance between the electrons is doubled. b, when the distance between the electrons is multiplied by 1.2. C. when the distance between the electrons is multiplied by 1/3. D. when the distance between the electrons is divided by 6.

The electromagnetic (EM) spectrum is the term used by scientists to describe the entire range of light that exists with a speed of 300 million meters per second. Complete: Atoms will emit visible and ultraviolet light ...   A. as electrons jump from higher energy levels to lower levels. B. as electrons jump from lower energy levels to higher levels. C. as the atoms condense from a gas to a liquid. D. as the electrons move about the atom within an orbit.

Which of the following statements about a black body are true? Select one or more: a.The spectrum of the cosmic background radiation corresponds with great accuracy to the radiation of a black body at a temperature of 2.7 K. b.A black body absorbs all the radiation that hits it, and emits no radiation at all. c.According to Planck's radiation law (black body distribution), the wavelength corresponding to the maximum energy density of the radiation decreases (and the frequency increases) as the temperature increases. d.A black body reflects all the radiation that hits it, and absorbs no radiation at all.

Which of the following statements about a black body are true? Select one or more: a. The spectrum of the cosmic background radiation corresponds with great accuracy to the radiation of a black body at a temperature of 2.7 K. b. A black body absorbs all the radiation that hits it, and emits no radiation at all. C. According to Planck's radiation law (black body distribution), the wavelength corresponding to the maximum energy density of the radiation decreases (and the frequency increases) as the temperature increases. d. A black body reflects all the radiation that hits it, and absorbs no radiation at all.

H3

Just answer question 5 please

a. Does a hot, thin gas emit a continuous spectrum, a bright line spectra with gaps between the lines, or a dark line spectra with all frequencies except the missing (absorbed) one? b. Why do we see dark line spectra when we look at stars? c. Both hydrogen and helium glow and absorb red. Are they the same frequency of red? d. A hot solid iron plate and a hot solid aluminum plate are the same temperature. Do the give off the same range of frequencies?

A photon in a laboratory experiment has an energy of 5.5 eV. What is the frequency of this photon? -34 Planck's constant is 6.63 x 10° J.S. Answer in units of Hz.

If a body is at 2000 K, the wavelength at which the body emits the maximum amount of radiation is a.) 1.45 um b.) 1.45 cm c.) 0.345 cm d.) 0.345 um

Direction: 1.Determine the number of electron,proton,and neutron in an atom, positive ions(cation)and negative ions(anion). 2. Draw the subatomic particles in proper location inside an atom/anion/cation. 3. Write your answer inside the box and use the symbol of electron, neutron and proton given below.