In Young's two-slit experiment, a beam of light from a slit reaches at a point on the screen one wavelength behind the wave from the other slit. What is observed on the screen at that point?
A) Dark fringe
B) An empty space
C) Bright-dark fringe
D) Dark-bright fringe
E) Bright fringe
E
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An electron has a velocity of 6.0 × 10^6 m/s in the positive x direction at a point where the magnetic field has the components Bx = 3.0 T, By = 1.5 T, and Bz = 2.0 T. What is the magnitude of the acceleration of the electron at this point?
a. 2.1 × 10^18 m/s2 b. 1.6 × 10^18 m/s2 c. 2.6 × 10^18 m/s2 d. 3.2 × 10^18 m/s2 e. 3.7 × 10^18 m/s2
One "food calorie" equals 1000 calories
Indicate whether the statement is true or false
Which of the following is not used as a moderator material for nuclear reactors?
A) sodium B) heavy water C) graphite D) boron E) These are all used as a moderator material for nuclear reactors.
The maximum mass of a white dwarf is
A) about the mass of our Sun. B) limitless; there is no theoretical limit to the maximum mass of a white dwarf. C) about 3 times the mass of our Sun. D) about 1.4 times the mass of our Sun.