The image formed in a plane mirror is
A) at the same distance in front of the mirror as the object is in front of the mirror.
B) at the same distance behind the mirror as the object is in front of the mirror.
C) at a shorter distance behind the mirror than the distance the object is in front of the mirror.
D) a real image behind the mirror.
E) at a larger distance behind the mirror than the distance the object is in front of the mirror.
B
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A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 ? is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (?t), where A = 80 ?T and ? = 50? rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA b. 18 mA c. 14 mA d. 22 mA e. zero
A researcher is investigating a cubic crystal with x rays. He is looking at Bragg reflection from the planes parallel to the cube faces
He finds that when using x rays of 0.165 nm a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in the crystal?
In the brain, a typical frequency for an alpha wave is ______ Hz and for a delta wave is ______ Hz
a. 2, 4 c. 12, 4 b. 3, 12 d. 10, 14
Mars's atmosphere is most similar in composition to the atmosphere of ________.
A. Mercury B. Venus C. the Moon D. Earth