The wavelength of the radiation in a microwave oven is 12 cm Part A How many photons are absorbed by 280 g of water as it's heated from 22° C to 90°C? Express your answer using two significant figures. N = ΜΕ ΑΣΦ Submit Request Answer ?

Consider a fission nuclear explosion producing a temperature of 24 million K (25∗107 K). a) What is be the peak wavelength of the thermally produced photons? b) What is the energy (in eV) for this peak wavelength photon?

How much energy, in joules per mole (J/mol), does a photon in the microwave region of the EM spectrum, contain? Assume the microwave has a frequency of 1.09 x 1010 s-1. Your answer should have 3 significant figures.

(a) If the power output of a 670 kHz radio station is 49.0 kW, how many photons per second are produced? 1.1679e32 X How does power relate to energy? Review the relationship between energy and frequency of a photon. photons/s (b) If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 125 km. Assume no reflection from the ground or absorption by the air. 2.138e21 If there is no reflection by the ground, what fraction of the radiated power reaches the receiver? What portion of the spherical surface do you need to consider here? photons/(s · m2) Additienel Mete niel

By what rate a photon emitted from a sodium vapor lamp? Assume that the lamp's light is monochromatic and of wavelength 589 nm? Answer : 1.5*10^20 s^-1

The threshold of dark-adapted (scotopic) vision is 4.5 ✕ 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 7.9 mm, how many photons per second enter the eye? photons/s

A) Astronomers measure the peak wavelength of a nearby star to be 410 nm. What is the star's temperature? B) How much energy does a single photon of light have at this wavelength? C) An electron bound in an unknown metal requires 1.45E-19 ] of energy under the photoelectric effect to become free of the metal. How much kinetic energy would it have if struck by the photon froft part (b)? D) What is the final speed of the elctron from part (c)?

The average threshold of dark-adapted (scotopic) vision is 4.00  10-11 W/m2 at a central wavelength of 500 nm. If light with this intensity and wavelength enters the eye and the pupil is open to its maximum diameter of 9.00 mm, how many photons per second enter the eye?  photons/s

3.24 A 3.0-V lashlight bulb draws (0,25 A, converting about 1.0% of the dissipated power into light (A 550 nm). If the beam has a cross-sectional area of 10 cm and is approximately cylindrical. (a) How many photons are emitted per second? (b) How many photons occupy each meter of the beam? (c) What is the flux density of the beam as it leaves the flashlight?

How many photons with a wavelength of 450 nm is required to have a mass of 1.25 micrograms?