When light of wavelength 400 nm is incident on a metal surface,
the stopping
potential of the photoelectrons is 0.600 V.
a. What is the work function of the metal?
b. What is the threshold frequency?
c. What is the maximum kinetic energy of the electron?
In: Physics
A proton (H+) is released at rest at a location where the electric potential is measured to be 3000 V.
The energy gained by the proton = _________ J BLANK-1 = __________ eV BLANK-2
The speed gained by the proton due to this potential is ______ m/s?
In: Physics
When 210 nm light falls on a metal, the current through a photoelectric circuit is brought to zero at a stopping voltage of 1.54 V . What is the work function of the metal? Express your answer using three significant figures.
In: Physics
Prove or disprove: two consecutive rotations about two different axis are commutative. That is, is RuRv = RvRu? (Hint: For simplicity, you can assume that the axis u is the x-axis and v is the y-axis without loss of gnerality).
In: Advanced Math
Using identities for time derivatives and del operators, show that the solution of the inhomogeneous wave equation for the potential V given by the Lorentz gauge (the expression containing an integral over volume), does indeed satisfy the inhomogeneous wave equation.
In: Physics
A small generator produces 2.4 V of peak emf. If it contains a 0.050-T permanent magnet and 96 wire loops, each of which is roughly a 6.0-cm diameter circle, at what frequency does the generator rotate?
In: Physics
In a differential amplifier, the noninverting input is 3 cos (600t + 45◦) mV and the inverting input is 4cos (600t - 45◦) mV. The output is
vo = 3cos (600t + 45◦) + 4.004cos (600t - 45◦) V. The CMRR is_____
dB.
In: Electrical Engineering
Briefly describe the following concepts/principles/items, use appropriate diagrams/equations/formulas/examples if needed:
i. Gaussian curve
ii. Coefficient of variation
iii. Confident interval
iv. Q test
v. Dialysis
In: Statistics and Probability
Electrons accelerated by a potential difference of 13.15 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength.
Calculate the wavelength of light emitted with the shortest possible wavelength.
In: Physics
Calculate the pH of the cathode compartment solution if the cell emf at 298 K is measured to be 0.600 V when [Zn2+]= 0.21 M and PH2= 0.87 atm .
Express answer using two decimal places.
Thank you!
In: Chemistry