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Why does the existence of a cutoff frequency in the photoelectric effect favor a particle theory of light rather than a wave theory?
Wiki User
∙ 10y ago
According to the wave theory, light of any frequency can cause electrons to be ejected as
long as the light is intense enough. A higher intensity corresponds to a greater electric
field magnitude and more energy. Therefore, there should be no frequency below which
the photoelectric effect does not occur. According to the particle theory, however, each
photon carries an amount of energy that depends upon its frequency. Increasing the
intensity of the light increases the number of photons but does not increase the energy of
the individual photons. The cutoff frequency is that frequency at which the energy of the
photon equals the work function. If the frequency of the incoming light is below the
cutoff, the electrons will not be ejected because no individual photon has enough energy
to impart to an electron.
Wiki User
∙ 10y ago
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How does a capacitor act as a filter?
The cutoff frequency of filter depends upon the value of capacitor and resistance. Therefore, below cutoff frequency or above this frequency, capacitor allow to pass all other frequencies.
What is band rate?
ANSWERED MY MUHAMMAD WALEED SHAIKH first of all we have to know that about band,so band is range of frequency which we have selected for example:we have a low pas filter it frequency always started from initial or 0 HZ upto cutoff frequency and here remember that cutoff frequency we will have to select after cutoff signal is rapidly down now about band rate so your signal is band at certain rate is called band rate.
What is meant by beta cutoff frequency?
The beta cut off frequency is the frequency at which the current amplification of an amplifier transistor drops to three decibels below its value at 1 kilohertz. This is used in electronic engineering.
Relation between cutoff frequency and bandwidth?
The relation between cut off frequency (fc) and band width is as follows: fc=Q*B.W where Q=(fL*fH)^1/2/(fH-fL) Q is quality factor. fL is low frequency. fH is high frequency.
High pass RC circuit?
Hi pass says it passes higher frequency signals and blocks lower pass signals. This isn't typically a hard cutoff point but the lower frequency signals get attenuated over a frequency range. The R stands for resistance and C for capacitance such that these components are used to create the pass band for the circuit.
How does a capacitor acts as a filter?
The cutoff frequency of filter depends upon the value of capacitor and resistance. Therefore, below cutoff frequency or above this frequency, capacitor allow to pass all other frequencies.
How does a capacitor act as a filter?
The cutoff frequency of filter depends upon the value of capacitor and resistance. Therefore, below cutoff frequency or above this frequency, capacitor allow to pass all other frequencies.
The attenuation in wave guides near the cutoff frequency is?
zero
What is the -3dB cutoff frequency?
A: It is a standard statement to signify that the amplitude is one half.
Why there is a cutoff requency in the photoelectric effect?
In any circumstance where a threshold of energy is required to free an electron from a bound state, an incoming photon must have at least that energy to do the job. The energy of a photon is proportional to the frequency of the light, so the minimum energy corresponds to a minimum frequency of the light, or maximum wavelength necessary to free an electron. This observation was a major step in the development of radiation theory (Einstein).
What is band rate?
ANSWERED MY MUHAMMAD WALEED SHAIKH first of all we have to know that about band,so band is range of frequency which we have selected for example:we have a low pas filter it frequency always started from initial or 0 HZ upto cutoff frequency and here remember that cutoff frequency we will have to select after cutoff signal is rapidly down now about band rate so your signal is band at certain rate is called band rate.
How value of c is calculated in an RC filter for a given value of r?
Time constant = R C C = time constant/R R = time constant/C When used as a filter, Cutoff frequency = 1 / (2 pi) R C R = 1 / (2 pi) (cutoff frequency) ( C ) C = 1 / (2 pi) (cutoff frequency) ( R )
What is the lowpass filter cutoff frequency that must be used to decimate to reduce the sampling rate from 8kHz to 4kHz?
2kHz - That's the nyquist frequency at a sample frequency of 4kHz.
What do you mean by 3 dB cutoff frequency?
3db frequency is the frequency at which the value in the graph is reduced by 3db level It's also known as the half-power point.
Give the difference between LPF and HPF?
LPF is a low pass LTI filter which passes the low frequency signals and reduce the amplitude of the signals with frequencies higher than the cutoff frequency. HPF is high pass LTI filter which passes the high frequencies and reduce the amplitude of the frequencies lower than filter's cutoff frequency.
What is meant by beta cutoff frequency?
The beta cut off frequency is the frequency at which the current amplification of an amplifier transistor drops to three decibels below its value at 1 kilohertz. This is used in electronic engineering.
How the capacitor set lower cutoff frequency limit?
A capacitor totally blocks DC current (it's an open circuit to it). The higher the frequency, the less resistance (impedance) the capacitor has.
