A thin layer of oil floats on a water puddle. An observer sees a colored pattern. This happens because
A. water transmits light and never reflects light.
B. sunlight's frequency range shifts to infrared at the boundary of water and oil.
C. two surfaces each transmit some light and reflect some light.
D. oil always does this, even if it is not on water.
Answer: C
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Single-Slit Diffraction: A beam of light of wavelength 600 nm passes through a slit that is 3.1 × 10-5 m wide, and then goes on to a screen that is 2.2 m from the slit. On the screen, how far is the second dark fringe from the center of the diffraction pattern?
A. 3.9 cm B. 4.2 cm C. 6.3 cm D. 2.1 cm E. 8.5 cm
Radioactive Decay: The activity of a sample reduces from 7.55 × 109 Bq to 5.11 × 109 Bq in 5.50 months.(a) What is its half life?(b) How many months from the start must one wait for the activity to decrease to 10% of its original value?
What will be an ideal response?
A car traveling 85 km h slows down at a constant 0.50 m/s2 just by “letting up on the gas.” Calculate
(a) the distance the car coasts before it stops, (b) the time it takes to stop, (c) the distance it travels during the first and fifth seconds.
Downloadable media utilizes the HTTP protocol.
Answer the following statement true (T) or false (F)