Using monochromatic light of 410 nm wavelength, a single thin slit forms a diffraction pattern,
with the first minimum at an angle of 40.0° from central maximum. The same slit, when illuminated by a new monochromatic light source, produces a diffraction pattern with the second minimum at a 60.0° angle from the central maximum. What is the wavelength of this new light?
A) 276 nm
B) 293 nm
C) 309 nm
D) 326 nm
E) 342 nm
A
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A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ? at 20°C and increases to 3.072 ? as indium starts to melt
What is the melting point of indium? (The temperature coefficient of resistivity for platinum is 3.9 × 10-3/C°.) A) 117°C B) 137°C C) 157°C D) 235°C E) 351°C
Briefly describe why the detection of neutrinos coming from the Sun supports the theory that the Sun generates energy by nuclear fusion
What will be an ideal response?
The figure shows a cross section of three parallel wires each carrying a current of 15 A. The currents in wires A and C are out of the paper, while that in wire B is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire C?
a.
90 mN
b.
54 mN
c.
30 mN
d.
18 mN
e.
36 mN
A 1500-kg car accelerates from rest to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 W)
A) 60 hp B) 70 hp C) 80 hp D) 90 hp