A laser produces 22.0 mW of light. In 4.00 hr, the laser emits 7.08×10^20 photons.What is the wavelength of the laser.

A certain X-ray machine generates X-rays from a beam of electrons accelerated from zero to 99.9999999 per cent the speed of light in a long linear accelerator of length 3.2 km. The electrons are generated in pulses of duration ∆t = 100 fs. The generated x-rays from the target are also short pulses (λ = 0.15 nm). Determine the energy of a single x-ray photon in the beam. a.) 8.27 eV              b.) 8.27 J                           c.) 8.27 keV                     d.) none of these.

How many photons are emitted per second from a semiconductor laser which emits 0.75 mW of light at a wavelength of 540 nm? O 239E+15 O 2.04E+15 O 2.85E+15 O 3.21E+15

2. A photon has a frequency of 7.50 x 1014 Hz, a. Determine the energy and the momentum of this photon. b. If all the energy of this photon were to be converted to mass, determine the equivalent mass for the particle. c. A microscopic specimen has a wavelength of 8.2 x 10-14m and a speed of 1.1 x 10° m/s. Determine the mass of this microscopic specimen.

A laser emits a pulse of light with wavelength 532 nm. If the total energy contained in the pulse is 1.2 J, the number of photons in the pulse is?

10% of the energy supplied to a bulb is radiated as visible light. How many photons are emitted per second by a 50 W bulb? Take the wavelength of visible light as 660 nm. A. 2.66 x 1019 B. 1.66 x 1020 C. 1.66 x 1019 D. 2.66 x 1020

A photon with a wavelength of 4.16 nm strikes a surface and emits an electron with kinetic energy of 124.6 eV (electron volts). What is the binding energy of the electron in J?