photoelectric effect

In the photoelectric experiment apparatus containing the collector and the emitter plate, a saturated photoelectron current is observed. If an external electric field is applied in the direction opposite to the motion of the photoelectrons, what is the change observed in each of the following? Give reasons.

i. The saturation value of the photocurrent,

ii. The kinetic energy of the photoelectrons striking the collector plate

Give reason for the following observation-

A radiation of wavelength $\lambda < {\lambda }_{\mathrm{threshold}}$ incident on a metal sphere placed on an insulated stand results in the emission of photoelectrons for some time and then stops.

A gas molecule absorbs a photon of wavelength $400 \mathrm{nm}$ and releases two photons one of which has wavelength $800 \mathrm{nm}$. Find the wavelength of other photon.

Can you explain the graph of photocurrent vs intensity?

Will electrons eject when an incident ray of $3\mathrm{kHz}$ is striked on a metal plate of threshold frequency $=5\mathrm{kHz}$

How can you plot the graph between frequency of incident radiation for different metals.

Variaion of photoelectric current with anode potential is correctly represented as .

Photoelectric current $\left({\mathrm{I}}_{\mathrm{P}}\right)$ vs Intensity $\left(\mathrm{I}\right)$ of incident radiation graph is correctly represented by $\left({\mathrm{I}}_{\mathrm{P}} \mathrm{vs} \mathrm{I}\right)$

What is photoelectric effect?

Which type of metals show the photoelectric effect with visible light$?$

Which type of plate, Hallwachs used in his experiment $?$ 

Explain what is Lenard's observation.

Which of the following statements is correct regarding the photoelectric experiment?

Monochromatic light is incident on a metal surface and electrons are released. The intensity of the incident light is increased. What changes, if any, occur in the rate of emission of electrons and the kinetic energy of the emitted electrons?

What is the effect of intensity on the stopping potential in photoelectric emission?

Define threshold frequency and photoelectric work function.

With neat labelled circuit diagram, describe the experiment to study the characteristics of photoelectric effect.

Explain the explanation given by Einstein about photo-electric effect. What is meant by threshold frequency?

A $600 \mathrm{W}$ mercury lamp emits monochromatic radiation of wavelength $331.3 \mathrm{nm}$. How many photons are emitted from the lamp per second?

($\mathrm{h}=6.626\times {10}^{-34} \mathrm{J} \mathrm{s}$; velocity of light $=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$)

Which alternative therapy is based on the concept of energy fields and involves the practitioner placing their hands lightly on or just above the client?