College Physics
3rd Edition
ISBN: 9780134201948
Author: Knight, Randall Dewey, Jones, Brian, Field, Stuart
Publisher: Pearson,
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Question
Chapter 25, Problem 74GP
To determine
The number of photons per second emitted by body.
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The energy flux of sunlight reaching the surface of the earth is 1.388 × 103 W/m2. How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm.
Consider the following statements about electromagnetic radiation and decide whether they are true or false. If they are false, correct them.
(a) The total intensity of radiation emitted from a black body at absolute temperature T is directly proportional to the temperature.
(b) As the temperature of a black body increases, the wavelength at which the maximum intensity is found decreases.
(c) Photons of radio-frequency radiation are higher in energy than photons of ultraviolet radiation.
(d) Photons of ultraviolet radiation have less energy than photons of infrared radiation.
(e) The kinetic energy of an electron ejected from a metal surface when the metal is irradiated with ultraviolet radiation is independent of the frequency of the radiation.
(f) The energy of a photon is inversely proportional to the wavelength of the radiation.
A photon has a wavelength of 560 nm.
a) What is the energy of the photon?
b) What is the frequency of the photon?
Round answers to 2 decimal places
a) E = ______________ J
b) f = _______________ Hz
Chapter 25 Solutions
College Physics
Ch. 25 - Prob. 1CQCh. 25 - The rapid vibration accompanying the swimming...Ch. 25 - Prob. 3CQCh. 25 - Prob. 4CQCh. 25 - Prob. 5CQCh. 25 - Prob. 6CQCh. 25 - The power lines that run through your neighborhood...Ch. 25 - The magnetic flux passing through a coil of wire...Ch. 25 - There is a counterclockwise induced current in the...Ch. 25 - A magnet dropped through a clear plastic tube...
Ch. 25 - The conducting loop in Figure Q25.11 is moving...Ch. 25 - Figure Q25.12 shows two concentric, conducting...Ch. 25 - Figure Q25.13 shows conducting loops next to each...Ch. 25 - Two loops of wire are stacked vertically, one...Ch. 25 - Prob. 15CQCh. 25 - A bar magnet is pushed toward a loop of wire, as...Ch. 25 - Prob. 17CQCh. 25 - A metal wire is resting on a U-shaped conducting...Ch. 25 - Prob. 19CQCh. 25 - Old-fashioned roof-mounted television antennas...Ch. 25 - An AM radio detects the oscillating magnetic field...Ch. 25 - Prob. 22CQCh. 25 - Prob. 23CQCh. 25 - The frequency of a beam of light is increased but...Ch. 25 - Arc welding uses electric current to make an...Ch. 25 - A circular loop of wire has an area of 0.30 m2. It...Ch. 25 - In Figure Q25.27, a square loop is rotating in the...Ch. 25 - A diamond-shaped loop of wire is pulled at a...Ch. 25 - Figure Q25.29 shows a triangular loop of wire in a...Ch. 25 - A device called a flip coil can be used to measure...Ch. 25 - The electromagnetic waves that carry FM radio...Ch. 25 - The beam from a laser is focused with a lens,...Ch. 25 - A spacecraft in orbit around the moon measures its...Ch. 25 - A 6.0 mW vertically polarized laser beam passes...Ch. 25 - Communication with submerged submarines via radio...Ch. 25 - Prob. 36MCQCh. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - A l0-cm-long wire is pulled along a U-shaped...Ch. 25 - Figure P25.4 shows a 15-cm-long metal rod pulled...Ch. 25 - Prob. 5PCh. 25 - In the rainy season, the Amazon flows fast and...Ch. 25 - A delivery truck with 2.8-m-high aluminum sides is...Ch. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10PCh. 25 - Prob. 11PCh. 25 - At a typical location in the United States, the...Ch. 25 - Prob. 13PCh. 25 - A magnet and a coil are oriented as shown in...Ch. 25 - A 1000-turn coil of wire 2.0 cm in diameter is in...Ch. 25 - Figure P25.I6 shows a 100-turn coil of wire of...Ch. 25 - Figure P25.17 shows a 10-cm-diameter loop in three...Ch. 25 - The plane of a loop of wire is perpendicular to a...Ch. 25 - Prob. 19PCh. 25 - Prob. 20PCh. 25 - Prob. 21PCh. 25 - A 5.0-cm-diameter loop of wire has resistance 1.2...Ch. 25 - Prob. 23PCh. 25 - Prob. 24PCh. 25 - Prob. 25PCh. 25 - Prob. 26PCh. 25 - A microwave oven operates at 2.4 GHz with an...Ch. 25 - The maximum allowed leakage of microwave radiation...Ch. 25 - Prob. 29PCh. 25 - Prob. 30PCh. 25 - At what distance from a 10 mW point source of...Ch. 25 - Prob. 32PCh. 25 - A radio antenna broadcasts a 1.0 MHz radio wave...Ch. 25 - A 200 MW laser pulse is focused with a lens to a...Ch. 25 - The intensity of a polarized electromagnetic wave...Ch. 25 - Prob. 36PCh. 25 - Prob. 37PCh. 25 - Prob. 38PCh. 25 - The polarization of a helium-neon laser can change...Ch. 25 - Prob. 40PCh. 25 - Prob. 41PCh. 25 - Prob. 42PCh. 25 - One recent study has shown that x rays with a...Ch. 25 - Prob. 44PCh. 25 - Prob. 45PCh. 25 - Prob. 46PCh. 25 - Prob. 47PCh. 25 - Prob. 48PCh. 25 - Prob. 49PCh. 25 - A particular species of copepod, a small marine...Ch. 25 - Prob. 51PCh. 25 - Prob. 52PCh. 25 - While using a dimmer switch to investigate a new...Ch. 25 - Prob. 54PCh. 25 - Prob. 55PCh. 25 - A python can detect thermal radiation with...Ch. 25 - If astronomers look toward any point in outer...Ch. 25 - A 100-turn, 2.0-cm diameter coil is at rest in a...Ch. 25 - A 25-turn, 10.0-cm-diameter coil is oriented in a...Ch. 25 - People immersed in strong unchanging magnetic...Ch. 25 - Prob. 61GPCh. 25 - Prob. 62GPCh. 25 - A 20-cm-long, zero-resistance wire is pulled...Ch. 25 - A TMS (transeranial magnetic stimulation) device...Ch. 25 - The 10-cm-wide, zero-resistance wire shown in...Ch. 25 - Experiments to study vision often need to track...Ch. 25 - A LASIK vision correction system uses a laser that...Ch. 25 - When the Voyager 2 spacecraft passed Neptune in...Ch. 25 - A new cordless phone emits 4.0 mW at 5.8 GHz. The...Ch. 25 - In reading the instruction manual that came with...Ch. 25 - Unpolarized light passes through a vertical...Ch. 25 - Prob. 73GPCh. 25 - Prob. 74GPCh. 25 - What is the wavelength of 27 MHz radio waves? A....Ch. 25 - If the frequency of the radio waves is increased,...Ch. 25 - Prob. 77MSPPCh. 25 - The metal detector will not detect insulators...Ch. 25 - A metal detector can detect the presence of metal...Ch. 25 - Which of the following changes would not produce a...
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- A photon carries 2.56 eV of energy. What is the photon's frequency? (h= 6.626 x 10-34 J-s; 1 eV = 1.60 x 10-19 J)arrow_forward(a) Find the energy of a photon having a frequency of 5.00 x 1017 Hz. Express your answers in units of electron volts (1 eV = 1.60 x 10-19 J.) 2,465.5 keV 1,345.4 keV 1,149.9 keV 2,071.9 keV (b) a photon having a wavelength of 5.00 x 102 nm. Express your answers in units of electron volts, ( 1 eV = 1.60 x10-19 J.) 2.49 eV 3.53 eV 4.62 eV 6.98 eVarrow_forwardFind the energy of (a) a photon having a frequency of 5.00 × 1017 Hz and (b) a photon having a wavelength of 3.00 × 102 nm. Express your answers in units of electron volts, noting that 1 eV = 1.60 × 10−19 J.arrow_forward
- A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct? A) The wavelength of X-ray photon is less than the wavelength of visible radiation photon. B) Both the photons have different energies. C) The speeds of both the photons in vacuum are different D) The frequency of X-ray photon is higher than the frequency of visible radiation photon.arrow_forwardA 193-nm-wavelength UV laser for eye surgery emits a 0.500 mJ pulse. How many photons does the light pulse contain?arrow_forwardIs your textbook the kind of idealized object (described in section on radiation laws) that absorbs all the radiation falling on it? Explain. How about the black sweater worn by one of your classmates?arrow_forward
- The frequency of orange light is 5.01 x 1014 Hz. How much energy does a photon of orange light carry? (h = 6.626 x 10-34 J·s; 1 eV = 1.60 x 10-19 J) 7.56 eV 5.43 eV 3.32 eV 2.07 eVarrow_forwardA high-band 5G cell phone transmission consists of electromagnetic waves with a frequency of 25 GHz. What is the wavelength of this cell phone transmission? m What is the energy of one photon of this EM radiation? J If the power is 296 W, how many photons does the tower emit during 3.06 hours of operation? photonsarrow_forwardThe distance between Planet X and a star is 1.8 x 1011 m. At the surface of Planet X, the average intensity of the radiation from the star is 13440 W/m2. If the star radiates isotropically, which of the following is the average power of the star? a. 7.64 x 1024 W b. 5.47 x 1027 W c. 9.69 x 1026 W d.4.95 x 1028 Warrow_forward
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