Which of the following types of electromagnetic radiation has the lowest energy?
a. x-rays
b. visible light
c. ultraviolet
d. gamma-rays
e. infrared radiation
E
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Energy Density: A 2.4 × 1014 Hz laser emits a 3.5-?s pulse that is 5.0 mm in diameter. The average energy density in the beam is 0.65 J/m3. What average power is emitted by this laser? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 3.8 kW B. 7.7 kW C. 12 kW D. 15 kW E. 19 kW
A spaceship visits Alpha Centauri and returns to Earth. Alpha Centauri is 4.5 light-years from Earth (our second closest star). The spaceship travels at one-half the speed of light for essentially all of its expedition
(a) How long was the ship gone according to an observer on the Earth? (b) How long was the ship gone according to an observer on the spaceship?
A projectile is fired from point 0 at the edge of a cliff, with initial velocity components of v0x = 60.0 m/s and v0y = 175 m/s, as shown in the figure
The projectile rises and then falls into the sea at point P. The time of flight of the projectile is 40.0 s, and it experiences no appreciable air resistance in flight. What is the height of the cliff? What will be an ideal response?
An elevator accelerates upward with an acceleration equal to the acceleration of gravity
A ray of light emitted from one wall inside the elevation at a height h relative to the floor of the elevator will hit the opposite wall at a height (relative to the floor) A) greater than h. B) less than h. C) equal to h.