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The inability of a lens to form a white image of a white object is known as ________
. The potential field π = 2π₯
2π¦π§ β π¦
3
π§ exists in a dielectric medium having π = 2π0 (a) Does V satisfy
Laplace`s equation? (b) calculate the total charge within the unit cube 0 < π₯, π¦, π§ < 1π.
The speed of a wave in deep water depends on its wavelength L and the
acceleration of free fall g.
What is a possible equation for the speed v of the wave?
A. v = β(gL/2Ο)
B. v = gL/4Ο2
C. v = 2Οβ(g/L)
D. v =2Οg/L
A and B are 420 m apart. A RUNS A CONSTANT VELOCITY OF 9M/ S. A runs with a constant velocity of 5m/s.
Where and when do they meet?
Green light of wavelength 550 nm is shone on potassium, which
has a work function of 2.0 eV. Calculate the maximum kinetic energy of the photoelectrons emitted.
The bright light emitted by sodium lamps comes from a transition between electrons at an energy level of β 3.04 eV falling to an energy level of -5.14 eV. Calculate the wavelength of the light emitted
A scanning electron microscope is operating with 25 keV electrons.
a) Calculate the energy, in J, possessed by the electrons (2 marks)
b) Calculate the velocity of the electron, given that the mass of an
electron is 9.11 Γ 10-31 kg (2 marks)
c) Calculate the momentum of the electrons (2 marks)
d) Hence calculate the wavelength of the electrons (2 marks)
e) What effect would increasing the electron energy have on the
wavelength, and what consequence would that have on the resolution of the images? (2 marks)
In ultrasound, increasing the frequency improves the resolution of the image but,
f) what happens to the depth of the scan that you can obtain when the frequency is increased?
An empty universe but two bodies attracted by their gravitational pull. The closer and massier they get the stronger they pull. Their speed will only increase.
How can there not be a starting distance d from which the maximum speed of the bodies does not surpasses the speed of light?
what are magnitude and direction of electric field that will just support an electron so that it long in air
A particle of mass m has a speed v=Ξ±/x, where x is itβs
displacement. Find the force F(x) responsible.
F(x)=-mΞ±2
/x3
