Question

A stellar object is emitting radiation at 1420 nm. A detector is capturing 8 107 photons...

A stellar object is emitting radiation at 1420 nm. A detector is capturing 8 107 photons per second at this wavelength. h = 6.63 x 10-34 J-s. c = 2.998 x 108 m/s.

(a) What is the total energy of the photons detected in one second?

__________J/s

(b) What is the total energy of the photons detected in one hour?

__________J/hr

Homework Answers

Answer #1

the energy of a photon is giving:

E=hc / λ

E =energy in Joules,

h = 6.63 x 10-34 J-s. c = 2.998 x 108 m/s.

here wave length = 1420 nm = 1.42*10^-6 m

therefore ;

E=6.63⋅10−34⋅2.998 ⋅108/     1.42*10^-6

E = 13.997 *10^-20

E = 1.3997 *10^-19 J

So that's our energy, per photon.

Here A detector is capturing 8 107 photons per second

Thus it will give us the total energy per second.

1.3997 *10^-19 J *8 .10^7 photons per second

=1.1338 *10^-11

An hour has 3600 seconds(60⋅60=3600).

So E(s)⋅3600 is what we want:

1.1338 *10^-11⋅3600

=4.08 *10^-8 Joules per hour

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A stellar object is emitting radiation at 1970 nm. A detector is capturing 9 107 photons...
A stellar object is emitting radiation at 1970 nm. A detector is capturing 9 107 photons per second at this wavelength. h = 6.63 x 10-34 J-s. c = 2.998 x 108 m/s. (a) What is the total energy of the photons detected in one second? J/s (b) What is the total energy of the photons detected in one hour? J/hr
A stellar object is emitting radiation at 1770 nm. A detector is capturing 7 107 photons...
A stellar object is emitting radiation at 1770 nm. A detector is capturing 7 107 photons per second at this wavelength. h = 6.63 x 10-34 J-s. c = 2.998 x 108 m/s. (a) What is the total energy of the photons detected in one second? J/s (b) What is the total energy of the photons detected in one hour? J/hr
What is the energy per mole of photons with a wavelength of 307.1 nm? (c=3.00×108 m/s,...
What is the energy per mole of photons with a wavelength of 307.1 nm? (c=3.00×108 m/s, h=6.63×10-34 J·s, NA=6.02×1023mol-1)
23.   Photons and Energy      A. A certain source emits radiation of wavelength 500.0 nm. Determine...
23.   Photons and Energy      A. A certain source emits radiation of wavelength 500.0 nm. Determine its frequency. Calculate the energy associated with this photon at 500.0 nm.    B. If it takes 3.36 x 10-19 J of energy to eject an electron from the surface of a certain metal, Calculate the frequency of this energy and the longest possible wavelength in nm.       C. Ionization energy is the energy required to remove an electron from an atom in...
An excited hydrogen atom emits light with a wavelength of 397.2 nm to reach the energy...
An excited hydrogen atom emits light with a wavelength of 397.2 nm to reach the energy level for which n = 2. In which principal quantum level did the electron begin? (c = 3.00 x 108 m/s, h = 6.63 x 10-34 J•s, RH = 2.18 x 10-18J).
1) Describe an example of each of the following that may be found of your kitchen:...
1) Describe an example of each of the following that may be found of your kitchen: Explain how your choice falls into this category, and if there is a chemical name or symbol for it, provide that as well. Provide a photo of your example with your ID card in it. a) a compound b) a heterogeneous mixture c) an element (symbol) Moving to the Caves… Lechuguilla Caves specifically. Check out this picture of crystals of gypsum left behind in...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT