Using this approach, Planck generated a theoretical expression for the wave- length distribution that agreed remarkably well with the experimental curves in Figure 39.3: 2Thc? I(A,T) = (39.6) Let's consider one of these early attempts. To describe the distribution of energy from a black body, we define I(A,T) da to be the intensity, or power per unit area, emitted in the wavelength interval da. The result of a calculation based on a classi- cal theory of blackbody radiation known as the Rayleigh-Jeans law is 2mck,T B I(1,T) = (39.3)

Q: alculate the energy in a mole of photons with a wavelength of 450 nanometers.

A: Photons have no mass, but they have energy E = hf = hc/λ. Here h = 6.626*10-34 Js is a universal…

Q: If an atom of neon-20 were moving at its root mean square velocity at 255°C, what would the de…

A: Root mean square velocity=3RTMGwhere ,         R=Universal gas constant         T=Temperature in…

Q: Excited hydrogen atoms emit light in the ultraviolet at 2.47 ´ 1015 Hz. What is the energy of a…

A: The energy of photon is given by  E = hf where E = energy of photon  h = Plank's constant = 6.626 X…

Q: How fast must a 139.3−g baseball travel in order to have a de Broglie wavelength that is equal to…

A: de Broglie's wavelength is given by the formula  λ = hmv λ = wavelength h = Planks constant =…

Q: A laser gives off a pulse of infrared light with a wavelength of 1054 nm and a total energy of 2.5…

A:

Q: Assuming that the smallest measurable wavelength in an experiment is 0.850 fm, what is the maximum…

A: Given: de Broglie wavelength λ = 0.850 fm Velocity (v) of object =  675 m⋅s−1 Known: Planck's…

Q: List the following there types of electromagnetic radiation-visible, gamma rays, and microwaves in…

A: The radiation which has both electric and magnetic fields that are travelling perpendicular to each…

Q: Calculate the energy of a photon in units of kJ/mol when it is emitted with a wavelength of 97.2nm.

A: The energy of a photon = hv The energy of 1 mole of photon = hv * NA Where, h is planks…

Q: Calculate the energy in joules of a photon of radiation whose wavelength is 423 nm

A: Wavelength (λ) = 423 nm = 423 x 10-9 m As, 1 nm = 10-9 m Energy (E) = ?

Q: Be sure to answer all parts How fast must a 143.9−g baseball travel in order to have a de Broglie…

A: Given data,  Mass of baseball = 143.9 g  de Broglie wavelength = 75.0 pm

Q: What is the energy of a single photon of microwave radiation with a wavelength of 0.0618 meters?…

A: Given,Wavelength = 0.0618 m

Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.