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In photoelect...

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In photoelectric effect the electrons are ejected from metals if the incident light has a certain maximum?

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Q. In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum :

Q. Electrons are ejected from the metal when a light of certain frequency strikes the surface of a metal, This phenomenon is known as photoelectric effect and the ejected electrons are called photoelectrons.
If true then type 1, if false then type 0

The ejected electrons from the surface of metal in photoelectric effect are called

Q. The electrons are emitted in the photoelectric effect from a metal surface

Only if the frequency of the incident radiation is above a certain threshold value

Only if the temperature of the surface is high

Q. The photoelectric effect is applied in some burglar alarms. A beam of light shines on a metal electrode in a vacuum tube(photoelectric cell) and causes electrons to be photoelectrically ejected from the surface of the metal. This electrode thus becomes the cathode. The ejected electrons are attracted towards the anode in the vacuum tube and the electrical circuit is completed by means of a battery. If the light beam is blocked by a burglar's arm, the electrical circuit is broken. This sets off the alarm system. What is the maximum wavelength of light that you could use for a burglar alarm if the cathode of the photoelectric cell is made of tungsten and electrons are ejected from tungsten with a kinetic energy of

8.0 \times 10^{- 12}

erg when the wavelength of the incident light is exactly

1.25 \times 10^{3} ˚ A

?

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