An FM radio station of frequency 98.1 MHz puts out a signal of 50,000 W. How many photons/s are emitted?
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An FM radio station of frequency 98.1 MHz puts out a signal of 50,000 W. How many photons/s are emitted?
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- Helium was first discovered when astronomers viewed the spectrum from the Sun and could not associate absorption lines associated with any terrestrial element. One wavelength that was strongly absorbed was 587.5 nm (1 nm = 1.0×10-9 m). What is the energy associated with this wavelength of light? a. 1.06 eV (or 1.70×10-19 J) b. 0.943 eV (or 1.51×10-19 J) c. 2.11 eV (or 3.38×10-19 J) d. 0.472 eV (or 7.57×10-20 J)For light with a wavelength of 350 nm and with an intensity of /= 10-8 W/m², what is the number of photons/(m²s) in the light beam?If all the energy from a 93 W light bulb is emitted, on average, at 530.0 nm, how many 530.0 nm photons must be emitted each second to account for all 93 W? Planck's constant is 6.6 x 1034 J*s and the speed of light is 3.0 x 10° m/s.
- One of the first signs of sunburn is the reddening of the skin (called erythema). As a very rough rule of thumb, erythema occurs if 14.0 mJ of ultraviolet light of approximately 308 nm wavelength (referred to as UVB radiation) is incident on the skin per square centimeter during a single exposure. How many photons are incident on 1.00 cm2 of skin in this amount of exposure? photons10% 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 1020A 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?