In a photocell bichromatic light of wavelength 2475 Å and 6000 Å are incident on cathode whose work function is 4.8 eV. If a uniform magnetic field of 3×10-53×10−5 Tesla exists parallel to the plate, the radius of the path described by the photoelectron will be (mass of electron = 9×10-319×10−31 kg)
(1) 1 cm
(2) 5 cm
(3) 10 cm
(4) 25 cm
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is
For the photoelectric effect, the maximum kinetic energy E1E1 of the emitted photoelectrons is plotted against the frequency v of the incident photons as shown in the figure. The slope of the curve gives
(a) Charge of the electron
(b) Work function of the metal
(c) Planck's constant
(d) Ratio of the Planck’s constant to electronic charge
The stopping potential VV for photoelectric emission from a metal surface is plotted along the Y-Y-axis and the frequency νν of incident light along the X-X-axis. A straight line is obtained as shown in the figure. Planck's constant is given by:
1. | the slope of the line. |
2. | the product of slope on the line and charge on the electron. |
3. | the product of intercept along the Y-Y-axis and mass of the electron. |
4. | the product of the slope and mass of the electron. |
In an experiment on the photoelectric effect, the frequency ff of the incident light is plotted against the stopping potential V0.V0. The work function of the photoelectric surface is given by:
(ee is an electronic charge)
1. | OB×eOB×e in eV |
2. | OBOB in volt |
3. | OAOA in eV |
4. | The slope of the line ABAB |
The stopping potential as a function of the frequency of the incident radiation is plotted for two different photoelectric surfaces AA and BB. The graphs demonstrate that AA's work function is:
1. | Greater than that of BB. | 2. | Smaller than that of BB. |
3. | Equal to that of BB. | 4. | No inference can be drawn about their work functions from the given graphs. |
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The value of stopping potential in the following diagram is given by:
1. | −4−4 V | 2. | −3−3 V |
3. | −2−2 V | 4. | −1−1 V |