The distance between the ruled lines on a diffraction grating is 1770 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the longest wavelength that appears in the third order spectrum? A) 590 nm
B) 570 nm
C) 550 nm
D) 530 nm
E) 610 nm
A
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A Sun-like star will experience a helium flash in the core if
a. it is less massive than about 3 solar masses. b. it has become a red giant star. c. it has formed a helium core. d. the material in the core has gradually become degenerate. e. All of the other choices are correct.
A ball is thrown at an original speed of 8.0 m/s at an angle of 35° above the horizontal. If there is no air resistance, what is the speed of the ball when it returns to the same horizontal level?
A) 4.0 m/s B) 8.0 m/s C) 16 m/s D) 9.8 m/s
A 6.0-?F air-filled capacitor is connected across a 100-V voltage source
After the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). How much ADDITIONAL charge flows from the voltage source, which remained connected during the process? A) 1.5 mC B) 2.1 mC C) 1.7 mC D) 2.5 mC E) 1.2 mC
Because Earth's orbit is slightly elliptical, Earth actually gets closer to the Sun during part of the year. When Earth is closer to the Sun its orbital speed is
A) less than when Earth is farthest away from the Sun. B) the same as when Earth is farthest away from the Sun. C) greater than when Earth is farthest away from the Sun. D) sometimes greater sometimes smaller than when Earth is farthest away from the Sun.