An AM radio transmitter radiates 500 kW at a frequency of 760 kHz. How many photons per second does the emitter emit
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An AM radio transmitter radiates 500 kW at a frequency of 760 kHz. How many photons per second does the emitter emit?
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- The threshold of dark-adapted (scotopic) vision is 4.0 × 10−11 W/m2 at a central wavelength of 500 nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 8.5 mm, how many photons per second enter the eye?An electron, traveling at a speed of 9.00 x 107 m/s, strikes the target of an X-ray tube. Upon impact, the electron decelerates to one-quarter of its original speed, an X-ray photon being emitted in the process. What is the wavelength of the photon? 2.67 x 10-11 m 3.76 x 10-11 m 2.88 x 10-11 m 5.34 x 10-11 m 5.75 x 10-11 mA light beam of wavelength 634 nm and intensity 170 W/m^2 shines on a target of area 1.72 m^2 for a duration of 3.75 s. How many photons from the light beam will have struck the target during this time? 3.50E+21 2.45E+21 4.55E+21 6.30E+21
- Item 5 An AM radio station operating at a frequency of 815 kHz radiates 310 kW of power from its antenna. ▬ ▬▬▬ Q Search ¯ Part A How many photons are emitted by the antenna every second? Express your answer using two significant figures. 15| ΑΣΦ N = Submit Provide Feedback Request Answer D ? photons/sOne 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? photons