Define thresold frequency. Is it a constant quantity for a metal surfa (2024)

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Define thresold frequency. Is it a constant quantity for a metal surfa? ›

For a given metal, there exists certain minimum frequency of the incident radiation below which no emission of photoelectrons takes place. This frequency is called threshold frequency. It is a constant quantity for a given metal surface.

The threshold frequency is the lowest frequency below which the photoelectric effect does not occur. The threshold frequency is defined as the lowest incident radiation frequency below which photoelectric emission is absolutely impossible regardless of the strength of the incident radiation.

Threshold frequency, ν0 is the minimum frequency which a photon must possess to eject an electron from a metal. It is different for different metals.

The threshold frequency for photo electric effect for a metal surface is found to be 4.8×1016 Hz.

Explanation: no because threshold frequency is property which only depends on nature of surface of metal and can only be altered by applying suitable chemicals on metal surfaceand not on intensity of light .

The threshold frequency ν0 for a metal is 7.0×1014 s−1.

The threshold frequency depends on the metal or material of the cathode.

For a given metal, there exists certain minimum frequency of the incident radiation below which no emission of photoelectrons takes place. This frequency is called threshold frequency. It is a constant quantity for a given metal surface.

Typical metal detector frequencies range from 3 KHz and go up to maybe 40 KHz. Some specialised machines operate beyond these ranges but the hobby metal detectors usually lie in this range. Physics dictates that the lower frequencies travel further into ground and react better to bigger, thicker targets.

Assertion :Threshold frequency is a characteristic for a metal. Reason: Threshold frequency is a maximum frequency required for the ejection of electron from the metal surface. Threshold frequency is a maximum frequency required for the ejection of electron from the metal surface.

What does the threshold frequency for a certain metal correspond to? ›

The threshold frequency of a metal corresponds to the wavelength of x nm. In two separate experiments A and B, incident radiations of wavelengths 12x nm and 14x nm respectively are used.

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation incident on this surface is 5 V. The incident radiation lies in JAIEEE-2006) (1) visible region (2) X-ray region (3) ultra-violet region (4) infra-red region 1.

The photoelectric threshold wavelength for a metal surface is 6600 Å.

Threshold frequency is the minimum frequency which a photon must possess to eject and electron from a metal. It is different for different metals. When a photon of frequency 1.0 × 10 15 s − 1 was allowed to hit a metal surface, an electron having 1.988 × 10 − 19 J of kinetic energy was emitted.

The threshold frequency is the minimum frequency a photon can be and still just overcome the work function (Φ) of a particular material. The threshold frequency is directly proportional to the work function and is given by f=E/h, where E is equal to Φ, f is the threshold frequency and h is Planck's constant.

The threshold frequency for a photosensitive metal is 3.3×104Hz. If light of frequency 8.2×1014Hz is incident on this metal. The cut-off voltage for the photoelectric emission is nearly. 2V.

Definition: The hearing threshold is the sound level below which a person's ear is unable to detect any sound. For adults, 0 dB is the reference level. A threshold shift is an increase in the hearing threshold for a particular sound frequency.

: the place or point of entering or beginning : outset.

Threshold energy is the minimum energy which must be possessed by reacting molecules in order to undergo effective collision which leads to formation of product molecules.

Wave theory says that light of any frequency should be capable of ejecting electrons. But electron emission occurred only for frequencies larger than a threshold frequency (ν₀₎.