What is threshold frequency?

What is threshold frequency?
by

1 Answer

Answer :

Ans –The minimum frequency required to eject out electron from an atom.
by

Related questions

What is Aufbau’s principle? How it helps to fill electrons in an atom in different orbitals?

Description : What is Aufbau’s principle? How it helps to fill electrons in an atom in different orbitals?

Last Answer : Ans Electrons are filled in orbitals of an atom according to increasing energies which is in accordance to (n+l) values of electrons. If (n+l )values are same the electron goes to orbital having lower value of n.

What do you mean by Pauli’e exclusive principle? What is its significance?

Description : What do you mean by Pauli’e exclusive principle? What is its significance?

Last Answer : Ans No two electrons will have same set of all q.no. If n,l,m are same i.e. same orbital ‘s’ will be differ. It shows that all electrons have a definite place in an atom or their own identity.

What is Hund’s rule of maximum multiplicity? What is its significance?

Description : What is Hund’s rule of maximum multiplicity? What is its significance?

Last Answer : Ans Pairing of electrons in an orbital takes place only when all orbitals of same sub-shell become singly occupied. It helps to equalize energy of a sub-shell

Explain the significance of spin quantum number.

Description : Explain the significance of spin quantum number.

Last Answer : Ans.The direction of spinning of an electron in an orbit as well as the net magnetic moment of an orbital.

Tell what would happen to the stability of an atom, with atomic number higher than18, if the aufbau principle was not introduced.

Description : Tell what would happen to the stability of an atom, with atomic number higher than18, if the aufbau principle was not introduced.

Last Answer : Ans. We cannot find out the exact reason of stability of an atom & why they should have filled inner orbits before outermost shell.

Explain why half-filled orbitals have extra stability.

Description : Explain why half-filled orbitals have extra stability.

Last Answer : Ans. It has symmetrical electron density as well as greater exchange energy.

How many of the following are possible: 1p, 2s, 3p, 3f, 3d.

Description : How many of the following are possible: 1p, 2s, 3p, 3f, 3d.

Last Answer : Ans.2s , 3p & 3d are possible.

Explain the significance of Azimuthal quantum number.

Description : Explain the significance of Azimuthal quantum number.

Last Answer : Ans. It refers as sub-energy level of an atom.

How many quantum numbers are needed to designate an orbital?

Description : How many quantum numbers are needed to designate an orbital?

Last Answer : Ans.Three quantum numbers.

What accounts for the stability of an electron in multi-electron atom?

Description : What accounts for the stability of an electron in multi-electron atom?

Last Answer : Ans. i.The angular momentum of an electron is integral multiple of h/2ח ii. The symmetrical electron density of an orbit. iii.The maximum transition energy of an orbital.

Is the energy of an electron in 2s orbital same as of that in 2p orbital? Why?

Description : Is the energy of an electron in 2s orbital same as of that in 2p orbital? Why?

Last Answer : Ans. No, the energy depends upon (n+l) values in an atom. Hence 2p orbital has greater energy than 2s.

“In reality all the s-orbitals are spherically symmetric.” What does this represent?

Description : “In reality all the s-orbitals are spherically symmetric.” What does this represent?

Last Answer : Ans. The probable density of an electron in s-orbital is equally distributed at all coordinates in space.

Why is s-orbital orbital considered non directional while p-orbital directional?

Description : Why is s-orbital orbital considered non directional while p-orbital directional?

Last Answer : Ans. Electron density in s-orbital is equal in all direction while it dumble shaped along one axis in p- orbitals.

Find the number of radial and angular nodes in 3d subshell?

Description : Find the number of radial and angular nodes in 3d subshell?

Last Answer : Ans. Zero-angular node as well as radial nodes.

How many maximum 3s electrons can have magnetic spin quantum number -1/2?

Description : How many maximum 3s electrons can have magnetic spin quantum number -1/2?

Last Answer : Ans. 1 electrons.

What are different types of quantum numbers , write them with their symbols ?

Description : What are different types of quantum numbers , write them with their symbols ?

Last Answer : Ans. 1.Principal Quantum Numbers (n) 2.Azimuthal Quantum Numbers(l) 3.Magnetic Quantum Numbers (m) 4.Spin Quantum Numbers(s)

Define Pauli’s exclusion principle ?

Description : Define Pauli’s exclusion principle ?

Last Answer : Ans. No two electrons in an atom can have same set ofall four quantum numbers. If three are same one Quantum number must have different value.

Give the points of Rutherford Model.

Description : Give the points of Rutherford Model.

Last Answer : Ans. 1. Atom is neutral. 2.Whole mass is concentrated in nucleus. 3.Electrons are revolving in orbits.

Write two properties which cannot be explain by wave nature of radiation

Description : Write two properties which cannot be explain by wave nature of radiation

Last Answer : Ans. 1.Photo electric effect 2. Black Body radiation

Write the draw back of Rutherford Atomic Model.

Description : Write the draw back of Rutherford Atomic Model.

Last Answer : Ans (1). He was unable to explain the stability of Atom. (2). He could not explain the line spectrum.

Why; e/m value is not constant for canal rays ?

Description : Why; e/m value is not constant for canal rays ?

Last Answer : Ans. Mass of particles of cathode rays is not constant.

Name the spectral series which appear in the region of electromagnetic spectrum. (a) Visible region (b) UV region (c) Far IR region

Description : Name the spectral series which appear in the region of electromagnetic spectrum. (a) Visible region (b) UV region (c) Far IR region

Last Answer : Ans: (a) Balmer Series (b) Lymen Series (c) Pfund Series

What is the difference between Quantum and photon?

Description : What is the difference between Quantum and photon?

Last Answer : Ans. The smallest packet of Energy of any radiation is called as Quantum and that of Light is known as Photon.

State Heisenberg Uncertainty Principle.

Description : State Heisenberg Uncertainty Principle.

Last Answer : Ans. It is impossible to determine the exact position & exact momentum or velocity of microscopic particle.

The threshold frequency is the frequency below which – (1) photo current increases with voltage (2) photo current decreases with voltage (3) photo electric emission is not possible (4) photo current is constant

Description : The threshold frequency is the frequency below which – (1) photo current increases with voltage (2) photo current decreases with voltage (3) photo electric emission is not possible (4) photo current is constant

Last Answer : (3) photo electric emission is not possible Explanation: The photoelectric effect is the emission of electrons by substances, especially metals, when light falls on their surfaces. The photoelectric ... gain sufficient energy to overcome the electrostatic barrier of the work function of the metal.

The threshold frequency is the frequency below which - (1) photo current is constant (2) photo current increases with voltage (3) photo current decreases with volt (4) photo electric emission is not possible

Description : The threshold frequency is the frequency below which - (1) photo current is constant (2) photo current increases with voltage (3) photo current decreases with volt (4) photo electric emission is not possible

Last Answer : (4) photo electric emission is not possible

In human relations the irritation threshold is the A. action that causes an annoyance. B. frequency of the annoying behavior. C. point at which a person notices something and becomes annoyed. D. lengt?

Description : In human relations the irritation threshold is the A. action that causes an annoyance. B. frequency of the annoying behavior. C. point at which a person notices something and becomes annoyed. D. lengt?

Last Answer : Need answer

The threshold frequency is the frequency below which – (1) photo current increases with voltage (2) photo current decreases with voltage (3) photo electric emission is not possible (4) photo current is constant

Description : The threshold frequency is the frequency below which – (1) photo current increases with voltage (2) photo current decreases with voltage (3) photo electric emission is not possible (4) photo current is constant

Last Answer : (3) photo electric emission is not possible Explanation: The photoelectric effect is the emission of electrons by substances, especially metals, when light falls on their surfaces. The photoelectric ... gain sufficient energy to overcome the electrostatic barrier of the work function of the metal.

The threshold frequency is the frequency below which - (1) photo current is constant (2) photo current increases with voltage (3) photo current decreases with volt (4) photo electric emission is not possible

Description : The threshold frequency is the frequency below which - (1) photo current is constant (2) photo current increases with voltage (3) photo current decreases with volt (4) photo electric emission is not possible

Last Answer : (4) photo electric emission is not possible

The threshold frequency is the frequency below which–

Description : The threshold frequency is the frequency below which–

Last Answer : Photoelectric emission is not possible

Compared with myelinated nerve fibres, non-myelinated nerve fibres : a. have a higher threshold for stimulation b. have a longer refractory period c. transmit impulses at a lower frequency d. all above

Description : Compared with myelinated nerve fibres, non-myelinated nerve fibres : a. have a higher threshold for stimulation b. have a longer refractory period c. transmit impulses at a lower frequency d. all above

Last Answer : all above

The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the (A) Increased temperature reduces the activation energy (B) Fraction of molecules having threshold energy increases (C) Collision frequency increases (D) Value of threshold energy decreases

Description : The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the (A) Increased temperature reduces the activation energy (B) Fraction of molecules having threshold energy increases (C) Collision frequency increases (D) Value of threshold energy decreases

Last Answer : (B) Fraction of molecules having threshold energy increases

Pick up the correct statement from the following: (A) The minimum frequency of light for which no electrons are emitted, is called threshold frequency (B) Polarising angle of glass is 57.5° (C) At the polarising angle, the reflected and refracted rays are orthogonal (D) All the above

Description : Pick up the correct statement from the following: (A) The minimum frequency of light for which no electrons are emitted, is called threshold frequency (B) Polarising angle of glass is 57.5° (C) At the polarising angle, the reflected and refracted rays are orthogonal (D) All the above

Last Answer : Answer: Option D

The minimum frequency required to eject electrons from a metallic surface is called a) Critical frequency b) Peak value of frequency c) Threshold frequency d)Photo frequency

Description : The minimum frequency required to eject electrons from a metallic surface is called a) Critical frequency b) Peak value of frequency c) Threshold frequency d)Photo frequency

Last Answer : c) Threshold frequency

The minimum energy required to eject an electron from a metal surface is called a) Intensity b) Threshold frequency c) Work function d) Photo energy

Description : The minimum energy required to eject an electron from a metal surface is called a) Intensity b) Threshold frequency c) Work function d) Photo energy

Last Answer : c) Work function

When a certain beam of light falls upon a metal surface, it ejects photoelectrons from it. The number of photoelectrons ejected per second by the beam of light depends upon one of the following. Is it proportional to: w) the threshold frequency of the metal x) the work function of the metal y) the frequency of the beam z) the intensity of the beam

Description : When a certain beam of light falls upon a metal surface, it ejects photoelectrons from it. The number of photoelectrons ejected per second by the beam of light depends upon one of the following. Is it ... the work function of the metal y) the frequency of the beam z) the intensity of the beam

Last Answer : ANSWER: Z -- THE INTENSITY OF THE BEAM

The threshold frequency is the frequency below which : (1) photo current increases with voltage (2) photo current decreases with voltage (3) photo electric emission is not possible (4) photo current is constant

Description : The threshold frequency is the frequency below which : (1) photo current increases with voltage (2) photo current decreases with voltage (3) photo electric emission is not possible (4) photo current is constant

Last Answer : photo electric emission is not possible

Define : (i)Threshold frequency (ii)Work function

Description : Define : (i)Threshold frequency (ii)Work function

Last Answer : Threshold frequency: The minimum frequency of incident radiation at which emission of photoelectrons starts is called Threshold frequency.  Work function: The amount of energy required to detach the electron from metal surface is called work function. 

Threshold limit value of copper in the atmospheric air is - (1) 0.001 mg/m3 (2) 0.01 mg/m3 (3) 1.0 mg/m3 (4) 5.0 mg/m3

Description : Threshold limit value of copper in the atmospheric air is - (1) 0.001 mg/m3 (2) 0.01 mg/m3 (3) 1.0 mg/m3 (4) 5.0 mg/m3

Last Answer : (3) 1.0 mg/m3 Explanation: Inspirable copper dust takes a predominantly fibrous effect. The ALV of copper aerosol in the workplace atmosphere is 0.5 mg/m3, while the threshold limit value (TLV) is 1.0 mg/m3.

What is the real threshold for money and happiness?

Description : What is the real threshold for money and happiness?

Last Answer : San Francisco – Manhattan, 110–120 grand for a single guy or gal & you’re still gonna need a roommate. This amount assumes the definition of happiness is an abscence of struggle.

If you hosted a lurve threshold party, what would your reaction be if the honoree didn't bother to show up?

Description : If you hosted a lurve threshold party, what would your reaction be if the honoree didn't bother to show up?

Last Answer : Maybe the honoree just isn’t into the parties? I’m not sure we can really impose this sort of responsibility onto other jellies, especially if they were never interested in lurve or lurve parties to begin with.

What is your threshold for pain?

Description : What is your threshold for pain?

Last Answer : 0 ill tap out now. I have emotional pain at nights, that I deal with daily. I don’t want any more.

What's your "TLDR" threshold?

Description : What's your "TLDR" threshold?

Last Answer : answer:I am a bit snobbish and ignore WoTs like the plague. Mark Twain once wrote sorry I wrote such a long letter; I didn’t have time to write a short one.

What, for you, is the threshold of personal financial debt?

Description : What, for you, is the threshold of personal financial debt?

Last Answer : answer:I have no credit card debt. None. I pay the bill in full every time. That way I get an interest free loan, paid for by the folks who only pay the minimum balance. If I had a running balance ... the boys. If you are one of the folks with a 42 flat screen on your credit card bill. Thanks.

Studies proving duration threshold for correlation between tanning bed use and melanoma?

Description : Studies proving duration threshold for correlation between tanning bed use and melanoma?

Last Answer : answer:The only safe level of UV-B expose is Zero. We use UV A, B and C here in the lab and treat B and C with a lot of respect. No way would I expose myself to 2 minutes of UV-B ... of info on the subject. Also you can use google scholar to find additional papers. Don't risk it. Take vitamin D.

What gives some people a higher pain threshold than others?

Description : What gives some people a higher pain threshold than others?

Last Answer : I think it has to do with how you’ve handled pain over a period of time. I have a high threshold and have never really taken pain meds. People who use a lot of medication have a lower threshold. So, I think it has more to do with your own historical behavior than something you are born with.

Where is your threshold of pain?

Description : Where is your threshold of pain?

Last Answer : for physical pain pretty high, it's the anticipation that gets to me. for emotional, turns out that it's right about the point where she rips out your heart and turns her back on you forever. ... I've ever experienced spiritual pain mental, I don't think I can really separate it from emotional.

Do men or women have a higher pain threshold?

Description : Do men or women have a higher pain threshold?

Last Answer : Women!! I get jittery when I get a headache, couldn’t imagine giving birth.

Gamers of , what do you think the stats of the average person would be irl (health, attack, damage threshold, AP, etc)?

Description : Gamers of , what do you think the stats of the average person would be irl (health, attack, damage threshold, AP, etc)?

Last Answer : This is impossible to answer without knowing if the range is 0-100, 0-10, 0-1000, etc.

Who is the author of a collection of poems called Golden Threshold? -Do You Know?

Description : Who is the author of a collection of poems called Golden Threshold? -Do You Know?

Last Answer : answer: