COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 26, Problem 37QAP
To determine
Energy of a low frequency radio photon (
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Question 10
I Review | Constants Periodic Table
he human eye can barely detect a star whose intensity at the earth's
urface is 1.6 x 10-11 W/m?
Part A
If the dark adapted eye has a pupil diameter of 6.0 mm , how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550 nm
?
X•10"
N =
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Three light sources are shone onto a plant:
i)
ii)
iii)
How much light (i.e. total number of photons) is available for the plant to use for photosynthesis over an 8 hr
photoperiod, considering the plant has a total leaf area of 0.175 m?
320 nm at an intensity of 200 umol photons.ms
440 nm at an intensity of 300 umol photons.ms
675 nm at an intensity of 300 umol photons.ms'
Chapter 26 Solutions
COLLEGE PHYSICS
Ch. 26 - Prob. 1QAPCh. 26 - Prob. 2QAPCh. 26 - Prob. 3QAPCh. 26 - Prob. 4QAPCh. 26 - Prob. 5QAPCh. 26 - Prob. 6QAPCh. 26 - Prob. 7QAPCh. 26 - Prob. 8QAPCh. 26 - Prob. 9QAPCh. 26 - Prob. 10QAP
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- •61 SSM The function (x) displayed in Eq. 38-27 can describe a free particle, for which the potential energy is U(x) = 0 in Schrödinger's equation (Eq. 38-19). Assume now that U(x) = U, = a constant in that equation. Show that Eq. 38-27 is a solution of Schrödinger's equation, with %3D -V2m(E – U) giving the angular wave number k of the particle. k k =arrow_forwardMY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) If the power output of a 670 kHz radio station is 49.0 kW, how many photons per second are produced? 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. photons/(s · m²) Additional Materialsarrow_forwardAnswer question in handwritingarrow_forward
- 7arrow_forwardHow 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?arrow_forward(a) If the power output of a 650-kHz radio station is 50.0 kW, how many photons per second are produced? (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 100 km. Assume no reflection from the ground or absorption by the air.arrow_forward
- (a) What is the ratio of power outputs by two microwave ovens having frequencies of 950 and 2560 MHz, if they emit the same number of photons per second? (b) What is the ratio of photons per second if they have the same power output?arrow_forwardExplain why characteristic x rays are the most energetic in the EM emission spectrum of a given element.arrow_forwardThe velocity of a proton emerging from a Van de Graaff accelerator is 25.0% of the speed of light. (a) What is the proton's wavelength? (b) What is its kinetic energy, assuming it is nonrelativistic? (c) What was the equivalent voltage through which it was accelerated?arrow_forward
- Integrated Concepts (a) What is the separation between double slits that produces a second-order minimum at 45.0° for 650-nm light? (b) What slit separation is needed to produce the same pattern for 1.00-keV protons.arrow_forwardIntegrated Concepts On its high power setting, a microwave oven produces 900 W of 2560 MHz microwaves. (a) How many photons per second is this? (b) How many photons are required to increase the temperature of a 0.500-kg mass of pasta by 45.0°C assuming a specific heat of 0.900kcal/kgC ? Neglect all other heat transfer. (c) How long must the microwave operator wait for their pasta to be ready?arrow_forward(a) What is the wavelength of a 1.00-eV photon? (b) Find its frequency in hertz. (c) Identify the type of EM radiation.arrow_forward
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