The electrons in a beam are moving at 18 m/s. (melectron = 9.11 × 10-31 kg, h = 6
626 × 10-34 J ? s)
(a) What is its de Broglie wavelength these electrons?
(b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of 30° with the normal to the grating?
(a) 40 μm (b) 81 μm
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The x component of the velocity of an object vibrating along the x-axis obeys the equation vx(t) = (0.445 m/s) sin[(25.4 rad/s)t + 0.223]
(a) What is the amplitude of the motion of this object? (b) What is the maximum acceleration of the vibrating object?
The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?
A) 45 days B) 36 days C) 54 days D) 31 days
Poor clusters of galaxies often contain an excess of E and S0 galaxies
a. True b. False Indicate whether the statement is true or false
The three laws dealing with the creation of various spectra are due to:
A) Newton. B) Fraunhofer. C) Kirchhoff. D) Bohr. E) Einstein.