(a) Find the energy in eV of photons in radio waves from an FM station that has a 89 MHz broadcast frequency. Ephoton eV (b) What does this imply about the number of photons per second that the radio station must broadcast? There are a small number of photons needed per second. There are a large number of photons needed per second.

In a beam of white light (wavelengths from 400 to 750 nm), what range of momentum can the photons have?

(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

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?

An 80W light source consumes predictably 80W of electrical power. Suppose that all of this energy is transformed into light of 580 nm wavelength. a) Find the frequency of the emitted light. b) Calculate how many photons per second are emitted in the visible region. c) Is there a relationship between the frequency of light and the number of photons emitted per second ? Comment.

About 0.1 eV is required to break a "hydrogen bond" in a protein molecule.(a) Calculate the minimum frequency of a photon that can accomplish this.(b) Calculate the maximum wavelength of a photon that can accomplish this.

A limitation on how many spectra per second can be recorded by a time-of-flight mass spectrometer is the time it takes the slowest ion to go from the source to the detector. Suppose we want to scan up to m/z 500 for ions with z = 1. Calculate the speed of this heaviest ion if it is accelerated through 5.00 kV in the source. How long would it take to drift 2.00 m through a spectrometer? At what frequency could you record spectra if a new extraction cycle were begun each time the heaviest ion reached the detector? What would be the frequency if you wanted to scan up to m/z 1000?

(a) How far away must you be from a 650-kHz radio station with power 50.0 kW for there to be only one photon per second per square meter? Assume no reflections or absorption, as if you were in deep outer space. (b) Discussthe implications for detecting intelligent life in other solar systems by detecting their radio broadcasts.

(a) 620 nanometers (nm)? (b) What are the energy and momentum of a photon of red light of wavelength What is the wavelength (in nm) of photons of energy 2.40 eV? 1.

How many photons per second are emitted by the antenna of a microwave oven, if its power output is 1.00 kW at a frequency of 2560 MHz?