A 3.0 cm section of a horizontal wire carrying a 6.7 A current from east to west is placed in a north to south 0.42 T magnetic field in the lab. What is the magnitude of the force on the 3.0 cm section of the wire?
A. 0.084 N
B. 0.17 N
C. 0.25 N
D. 0.0017 N
E. 0.0025 N
A. 0.084 N
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Answer the following statement true (T) or false (F)
Why is the sky blue (on Earth)?
A) because molecules scatter blue light more effectively than red light B) because the Sun emits mostly blue light C) because molecules scatter red light more effectively than blue light D) because deep space is blue in color E) No one knows; this is one of the great mysteries of science.
One of the emission lines described by the original version of Balmer's formula has wavelength 377nm. What is the value of n in Balmer's formula that gives this emission line?
A) 11 B) 12 C) 13 D) 14
What is the limiting angle of resolution for a lens of radius 2.0 mm when viewing with light having a wavelength of 600 nm?
A) 1.8 × 10-7 rad B) 1.3 × 10-4 rad C) 1.5 × 10-7 rad D) 1.5 × 10-4 rad E) 1.8 × 10-4 rad