Two light bulbs are placed side by side. The first light bulb emits red light of...
Two light bulbs are placed side by side. The first light bulb emits red light of wavelength 700 nm, and the second light bulb emits violet light of wavelength 400 nm. Your eye receives light of the same intensity from both the red light bulb and the violet light bulb. Which of the following statements is correct? Explain your reasoning.
(i) Your eye receives the same number of photons per second from both bulbs.
(ii) Your eye receives more photons per second from the red bulb.
(iii) Your eye receives more photons per second from the violet bulb.
(iv) Two of the above are possible.
(v) All of (i), (ii), and (iii) are possible.
Homework Answers
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Two light bulbs are placed side by side. The first light
bulb emits red light of...
Two light bulbs are placed side by side. The first light bulb emits red light of...
Two light bulbs are placed side by side. The first light bulb emits red light of wavelength 700 nm, and the second light bulb emits violet light of wavelength 400 nm. (a) Fill in the blanks in each of the following statements with the word greater, the word smaller, the phrase the same, or the phrase don’t know. (i) Compared to the photons of red light, the photons of violet light have __________ frequency. (ii) Compared to the photons of...
Activity 26-1. Photons I [Accompanies Section 26-2] Two light bulbs are placed side by side. The...
Activity 26-1. Photons I [Accompanies Section 26-2] Two light
bulbs are placed side by side. The first light bulb emits red light
of wavelength 700 nm, and the second light bulb emits violet light
of wavelength 400 nm. (a) Fill in the blanks in each of the
following statements with the word greater, the word smaller, the
phrase the same, or the phrase don’t know. (i) Compared to the
photons of red light, the photons of violet light have __________...
28. A red laser pointer emits light with a wavelength of 650 nm. a. What is...
28. A red laser pointer emits light with a wavelength of 650 nm. a. What is the frequency of this light? b. What is the energy of 1 mole of these photons? 29. What are all the possible values for I and my when n=3?
The illustration shows the spectrum of electromagnetic radiation emitted by a blackbody at two different Kelvin...
The illustration shows the
spectrum of electromagnetic radiation emitted by a blackbody at two
different Kelvin temperatures. The range of visible frequencies
(those that can be detected by the human eye) is also shown. (a) No
matter what the value of the Kelvin temperature T, the spectrum
decreases to zero at very high frequencies. Why is this? (i) At
very high frequencies the photon energy is very small compared to
kT. (ii) At very high frequencies the photon energy is...
An LED emits red light at a wavelength of 670 nm. In one second, the LED...
An LED emits red light at a wavelength of 670 nm. In one second, the LED uses 8.0 J of energy to emit photons. How many photons does the LED emit in one second? 2.7*10^19 photons 2.7x10^28 photons 3.0x10^19 photons 2.4x10^18 photons
A sodium vapor light isotropically emits 15W of light energy at 589 nm. If your pupil...
A sodium vapor light isotropically emits 15W of light energy at 589 nm. If your pupil has a diameter of 4.5 mm, how many photons will pass into your eye every second from a distance of 12 m? 12 km? The threshold of seeing is about 5 photons/second. How far away can you see this 15W bulb? Note that the flux of a light source is the power absorbed/area.
If a 120-W lightbulb emits 2.5 % of the input energy as visible light (average wavelength...
If a 120-W lightbulb emits 2.5 % of the input energy as visible
light (average wavelength 550 nm) uniformly in all directions.
Part A
How many photons per second of visible light will strike the
pupil (4.0 mm diameter) of the eye of an observer 1.6 m away?
Express your answer using two significant figures.
Part B
How many photons per second of visible light will strike the
pupil (4.0 mm diameter) of the eye of an observer 1.5 km...
A flash lamp is placed at the center of a solid sphere of dense flint glass...
A flash lamp is placed at the center of a solid sphere of dense
flint glass of radius 1.00 m. A second, identical flash lamp is
placed at the center of a solid sphere of quartz also of radius
1.00 m. At the same instant both lamps are turned on, each
producing a flash of white light (that is, light of all visible
colors).
Using the graph shown, rank the times of the
following events, from earliest to latest.
(i)...
(b) Fill in the blanks in each of the following statements with the word red, the...
(b) Fill in the
blanks in each of the following statements with the word
red, the word violet, the word infrared,
the word ultraviolet, or the phrase don’t
know.(i) For the lower-temperature blackbody, in the visible
range (from red to violet) the blackbody emits more __________
light than it does __________ light. Hence to the naked eye the
color of the light emitted by this lower-temperature blackbody will
be __________, even though the frequency at which this blackbody
emits most...
If a 100-W lightbulb emits 3.5 % of the input energy as visible light (average wavelength...
If a 100-W lightbulb emits 3.5 % of the input energy as visible light (average wavelength 550 nm) uniformly in all directions. A.How many photons per second of visible light will strike the pupil (4.0 mm diameter) of the eye of an observer 1.3 m away? B.How many photons per second of visible light will strike the pupil (4.0 mm diameter) of the eye of an observer 1.3 km away?
Activity 26-1. Photons I [Accompanies Section 26-2] Two light
bulbs are placed side by side. The first light bulb emits red light
of wavelength 700 nm, and the second light bulb emits violet light
of wavelength 400 nm. (a) Fill in the blanks in each of the
following statements with the word greater, the word smaller, the
phrase the same, or the phrase don’t know. (i) Compared to the
photons of red light, the photons of violet light have __________...
28. A red laser pointer emits light with a wavelength of 650 nm. a. What is the frequency of this light? b. What is the energy of 1 mole of these photons? 29. What are all the possible values for I and my when n=3?
The illustration shows the
spectrum of electromagnetic radiation emitted by a blackbody at two
different Kelvin temperatures. The range of visible frequencies
(those that can be detected by the human eye) is also shown. (a) No
matter what the value of the Kelvin temperature T, the spectrum
decreases to zero at very high frequencies. Why is this? (i) At
very high frequencies the photon energy is very small compared to
kT. (ii) At very high frequencies the photon energy is...
An LED emits red light at a wavelength of 670 nm. In one second, the LED uses 8.0 J of energy to emit photons. How many photons does the LED emit in one second? 2.7*10^19 photons 2.7x10^28 photons 3.0x10^19 photons 2.4x10^18 photons
If a 120-W lightbulb emits 2.5 % of the input energy as visible
light (average wavelength 550 nm) uniformly in all directions.
Part A
How many photons per second of visible light will strike the
pupil (4.0 mm diameter) of the eye of an observer 1.6 m away?
Express your answer using two significant figures.
Part B
How many photons per second of visible light will strike the
pupil (4.0 mm diameter) of the eye of an observer 1.5 km...
A flash lamp is placed at the center of a solid sphere of dense
flint glass of radius 1.00 m. A second, identical flash lamp is
placed at the center of a solid sphere of quartz also of radius
1.00 m. At the same instant both lamps are turned on, each
producing a flash of white light (that is, light of all visible
colors).
Using the graph shown, rank the times of the
following events, from earliest to latest.
(i)...
(b) Fill in the
blanks in each of the following statements with the word
red, the word violet, the word infrared,
the word ultraviolet, or the phrase don’t
know.(i) For the lower-temperature blackbody, in the visible
range (from red to violet) the blackbody emits more __________
light than it does __________ light. Hence to the naked eye the
color of the light emitted by this lower-temperature blackbody will
be __________, even though the frequency at which this blackbody
emits most...
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