The threshold of dark-adapted (scotopic) vision is 2.8 ✕ 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 8.4 mm, how many photons per second enter the eye? _________photons/s

1If an electron moves from n = 5 to n = 1, what wavelength of light is emitted? (h = 6.626 x 10-34, 1 eV = 1.6 x 10-19 J)   4008 nm   434 nm   95 nm   1281 nm   2Which of the following best describes a frame of reference?   an experiment that proved that Earth did not have an aether wind   the theory that describes the behavior and characteristics of objects moving at relativistic speeds   the effect of the slowing of time as an object moves with high speeds   a point in which someone relates the behavior of an object from one perspective professor can you answer the 2 questions please

The work function and cut-off frequency for platinum are 6.35 eV and 1.90 X 1015 ?? respectively. What is the maximum wavelength of light incident on platinum releases photoelectrons from the platinum’s surface? a) 188 nm b) 158 nm c) 168 nm d) 178 nm

Part A Estimate the number of photons emitted by the Sun in a year. (Take the average wavelength to be 550 nm and the intensity of sunlight reaching the Earth (outer atmosphere) as 1350 W/m².) VE ΑΣΦ 3.74 10 ● Submit ? Previous Answers Request Answer photons/yr

A beam of 400 nm light is adjusted to have the same intensity as a beam of 600 nm light. How does the number of photons in the 400nm beam, N400 compare to the number of photons, N600 in the 600 nm beam.   Question 5 options:   N400 = 2*N600   N400 = 32600   N400 = N600   N400 = 23600   N400 = 2600   None of the other responses are correct.

Your eyes have three different types of cones with maximum absorption at 437 nm, 533 nm, and 564 nm. What photon energies correspond to these wavelengths?

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/s

The intensity of light reaching Earth is about 1400 W/m². Part A Determine the number of photons reaching a 1.0-m² area each second. Assume that the wavelength of the photons hitting the Earth is 520 nm. Express your answer in photons. N = Submit IVE ΑΣΦ Request Answer ? photons

After you calibrate the SpectroVis Plus spectrometer, you must a. run a full spectrum by selecting Sensors/Calibrate/Full Spectrum. O b. change the mode by selecting Sensors/Time-Based. Oc. collect a full spectrum of the sample to determine the wavelength of maximum absorbance. O d. change the mode by selecting Sensors/Data Collection.

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? photons