How long does it take a light beam to cross a 6. m wide room? If the air were replaced with a transparent medium of index n, how much longer would it take?
What will be an ideal response?
2 × 10-8 s; n times longer
You might also like to view...
Fourier analysis makes central use of
A) wave superposition. B) partial tones. C) harmonics. D) none of the above
Plants get their energy directly from the Sun and their carbon from the atmosphere. Given this, they can be classified metabolically as
A) photoheterotrophs B) chemoheterotrophs C) chemoautotrophs D) photoautotrophs
A parallel-plate capacitor has a voltage V = 6.0 V between its plates. Each plate carries a surface charge density ? = 7.0 nC/m2. What is the separation of the plates?
A) 8.2 mm B) 2.5 mm C) 1.2 mm D) 5.6 mm E) 7.6 mm
Many galaxies with erupting black holes are found ____
a. in poor clusters with little intergalactic gas b. isolated in space c. in one of a pair of orbiting galaxies d. very close to the Milky Way galaxy e. in the Local Group