The form of electromagnetic radiation least blocked by a dark nebula is ________
Fill in the blank(s) with correct word
radio waves
You might also like to view...
Standing Sound Waves: A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is 0.88 m long and open at both ends, into its second overtone resonance. What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s.
A. 38 m/s B. 36 m/s C. 34 m/s D. 32 m/s E. 30 m/s
The amount of friction that occurs when two blocks slide against each other depends on
A) how much they are pressed together. B) the "stickiness" of atoms on their surfaces. C) the kinds of material being pressed. D) all of the above
A parallel-plate capacitor has dimensions 4.3 cm × 4.6 cm. The plates are separated by a 1.0-mm thickness of paper (dielectric constant ? = 3.7). What is the charge that can be stored on this capacitor, when connected to a 1.2-V battery? (?0 = 8.85 × 10^?12 C2/N?m2)
a. 2.0 × 10^?12 C b. 3.9 × 10^?12 C c. 3.9 × 10^?11 C d. 7.8 × 10^?11 C e. 6.8 × 10^?11 C
Why does a star grow larger after it exhausts its core hydrogen?
A) The outer layers of the star are no longer gravitationally attracted to the core. B) The internal radiation generated by the hydrogen fusion in the core has heated the outer layers enough that they can expand after the star is no longer fusing hydrogen. C) Helium fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward. D) Helium fusion in the core generates enough thermal pressure to push the upper layers outward. E) Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.