Light of wavelength 420 nm is incident on a slit of width 0.20 mm, and a diffraction pattern is produced on a screen that is 1.80 m from the slit. What is the width of the central bright fringe? (1 nm = 10?9 m)
a. 3.8E–3 m
b. 7.6E–3 m
c. 1.2E–3 m
d. 1.4E–2 m
e. 2.0E–2 m
b
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The magnetic moment of a current loop does not depend upon
A) the area. B) the current. C) the magnetic field.
I observe a galaxy that is 100 million light years away. Which of the following do I see?
A) the light from the galaxy as it is today, and it is redshifted B) the light from the galaxy as it was 100 million years ago, and it is redshifted C) the light from the galaxy as it is today, and it is blueshifted D) the light from the galaxy as it was 100 million years ago, and it is blueshifted E) Nothing: the galaxy lies beyond the cosmological horizon.
The armature (or spinning portion) of a motor is accelerated uniformly from rest to a rotational velocity of 1500 rev/min in 10 seconds. The rotational acceleration of the motor is
A. 150 rad/s2. B. zero. C. 31.4 rad/s2. D. 15.7 rad/s2. E. 75 rad/s2.
Different colors correspond to electromagnetic waves of different
A) frequencies. B) speeds. C) amplitudes. D) weights. E) intensities.