Particle Nature of Electromagnetic Radiations

Name the phenomenon which shows the quantum nature of electromagnetic radiation. 

What is the quantum nature of electromagnetic radiation.

The amount of light emitted (intensity of radiation) from a black body and its spectral distribution depends only on its temperature.

_____ black approximates fairly closely to the black body.

What are the properties of black body?

What do you mean by the term photoelectrons?

The photoelectric effect is the emission of _____ or other free carriers when light shines on a material.

$1$ mole of photons, each of frequency $250 {\mathrm{s}}^{-1}$ would have approximately a total energy of $1 \mathrm{e}\mathrm{r}\mathrm{g}$.

Light of wavelength $\mathrm{\lambda }$, shines on a metal surface with intensity $\mathrm{X}$, and the metal emits $\mathrm{Y}$ electrons per second of average energy $\mathrm{Z}$. What will happen to $\mathrm{Y}$ and $\mathrm{Z}$ if $\mathrm{X}$ is doubled?

In photoelectric effect, the kinetic energy of the photoelectrons increases linearly with the frequency of incident light.

A certain metal has a work function of $\Phi =2\mathrm{eV}$. It is irradiated first with $1 \mathrm{W}$ of $400\mathrm{nm}$ light and later with $1 \mathrm{W}$ of $800\mathrm{nm}$ light. Among the following, the correct statement is: [Given:Planck constant $\left(\mathrm{h}\right)$$=6.626\times {10}^{-34} {\mathrm{m}}^2{\mathrm{kgs}}^{-1}$ Speed of light $\left(\mathrm{c}\right)=3\times {10}^8 {\mathrm{ms}}^{-1}$]

A certain stellar body has radius $50R_s$ and temperature $2T_s$ and is at a distance of $2\times {10}^{10} \mathrm{AU}$ from the earth. Here, $\mathrm{AU}$ refers to the earth-sun distance and $R_s$ and $T_s$ refer to the sun's radius and temperature, respectively. Take, both star and sun to be ideal black bodies. The ratio of the power received on earth from the stellar body as compared to that received from the sun is close to

What is the number of photons of light with a wavelength of $4000 \mathrm{pm}$ that provide $1 \mathrm{J}$ of energy?

If the work function for Caesium $\left(\mathrm{Cs}\right)$ atom is $1.9 \mathrm{eV}$, find the approximate value of its threshold wavelength.

Stefan-Boltzmann law states that the energy radiated per unit area per unit time by the black body is

The maximum kinetic energy of the photoelectrons is found to be $6.63\mathrm{ }\times \mathrm{ }{10}^{-19}\mathrm{ }\mathrm{J}$ when the metal is irradiated with radiation of frequency $3\mathrm{ }\times \mathrm{ }{10}^{15}\mathrm{ }\mathrm{H}\mathrm{z}$. The threshold frequency of the metal is:

With increasing biasing voltage of a photo diode, the photocurrent magnitude:

Identify the least stable among the following:

a. Li^- 

b. Be^-

c. B^-

d. C^-

The quantum numbers +1/2and -1/2 for the electron spin represen

Using s, p, d, f  notations, describe the orbital with the following quantum numbers.

(d) n=3, l=2