Diffraction Gratings: Consider an experiment using a diffraction grating with 7000 lines/cm, a screen 2.50 m away, and a 440-nm wavelength beam of light.(a) How many side maxima will be observed on one side of the central maximum?(b) How far apart on the screen are the first-order and second-order maxima on the same side of the central maximum?
What will be an ideal response?
(a) 3 (b) 1.15 meters
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Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Active galactic nuclei exist tend to become less active as they age. B) Supermassive black holes existed only when the universe was young, and no longer exist today. C) Active galactic nuclei can form only at large distances from the Milky Way. D) The jets seen in many active galactic nuclei must cause them to move far away from us.
An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 5.0 ms. What is the magnitude of this acceleration?
A. 2.5 km/s2 B. 0.80 km/s2 C. 1.6 km/s2 D. 1.3 km/s2 E. 3.2 km/s2
Air pressure is 1.0 × 10^5 N/m2, air density is 1.3 kg/m3, and the density of soft drinks is 1.0 × 10^3 kg/m3 . If one blows carefully across the top of a straw sticking up 0.080 m from the liquid in a soft drink can, it is possible to make the soft drink rise half way up the straw and stay there. How fast must the air be blown across the top of the straw?
a. 76 m/s c. 25 m/s b. 27 m/s d. 0.99 m/s
The very first living organisms on the Earth were probably
A) chemoheterotrophs B) photoautotrophs C) photoheterotrophs D) chemoautotrophs