What is the ratio of the power levels of two sounds with intensity levels of 40. dB and 70. dB?
What will be an ideal response?
1000:1
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Quasars are____
a. spiral galaxies with unusually luminous nuclei b. elliptical galaxies with very broad emission lines c. explained by the double-exhaust model d. extremely luminous objects with high redshifts e. glowing green gases due to excitation from energy from an active core
A parallel-plate capacitor consists of two parallel, square plates that have dimensions 1.0 cm by 1.0 cm
If the plates are separated by 1.0 mm, and the space between them is filled with teflon, what is the capacitance of this capacitor? (The dielectric constant for teflon is 2.1, and ?0 = 8.85 × 10-12 C2/N ? m2.) A) 1.9 pF B) 0.44 pF C) 2.1 pF D) 0.89 pF
Three strings on a guitar are first stretched to the same tension. The first of the strings is heavy (thick), the third is light (thin), and the second is in between. Rank them according to the speed at which waves would propagate along them if they were plucked, with the fastest last
1.(3) (2) (1) 2.(3) (1) (2) 3.(1) (2) (3) 4.The waves would propagate at the same speed through each.
A cyclotron operates at 10. MHz. What magnetic field is needed to accelerate protons?
A) 0.25 T B) 0.25 Gauss C) 0.12 T D) 1.1 T E) 0.66 T