The power of a red laser (A = 630 nm) is 2.00 watts (abbreviated W, where 1 W = 1 J/s). How many photons per second does the laser emit?
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- A 100 W sodium lamp (l = 589 nm) radiates energy uniformly in all directions. (a) At what rate are photons emitted by the lamp? (b) At what distance from the lamp will a totally absorbing screen absorb photons at the rate of 1.00 photon/cm2 s? (c) What is the photon flux (photons per unit area per unit time) on a small screen 2.00 m from the lamp?A laser emits light at a wavelength of 678 nm. How many photons are required to emit 1 joule of energy?The power of a red laser (λ = 630 nm) is 2.00 watts (abbreviated W, where 1 W = 1 J/s). How many photons per second does the laser emit?
- Q11A typical red laser pointer has a power output of 1.50 mW and a wavelength of 680 nm. Find how many photons per second the laser emits in units of 10¹5 photons/sec. (A) 2.31 (B) 5.13 (C) 4.97 (D) 7.49 (E) 3.78A photon has an energy E and wavelength l before scattering from a free electron. After scattering through a 135° angle, the photon’s wavelength has increased by 10.0%. Find the initial wavelength and energy of the photon.