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Dinoflagellates are singlecell creatures that float in theworld's oceans; many types are bioluminescent. When disurbed by motion in the water, a typical bioluminescent dinoflagellate emits 100,000,000 photons in a 0.10 -s-long flash of light of wavelength 460 nm. What is the power of the flash in watts?

Short Answer

Expert verified
The power of the flash can be found by first calculating the energy of a single photon using Planck's formula and the provided wavelength, then finding the total energy of the flash by multiplying the energy of a single photon with the number of photons in the flash, and finally dividing the total energy by the duration of the flash.

Step by step solution

01

Calculate Energy of a Single Photon

Firstly, calculate the energy \(E\) of a single photon using the formula \(E = hf\), where \(h\) is Planck's constant (6.626 * \(10^{-34}\) m^2 kg / s) and \(f\) is the frequency of the light. The frequency \(f\) can be calculated from the provided wavelength \(\lambda = 460 nm\) (converted to meters) by using the formula \(f = c / \lambda\), where \(c\) is the speed of light (3.0 * \(10^8\) m/s).
02

Calculate Total Energy of the Flash

Then, calculate the total energy \(E_{total}\) in the light flash by multiplying the energy of a single photon \(E\) with the number of photons emitted (100,000,000). Thus, \(E_{total} = E * 100,000,000\).
03

Find the Power of the Flash

The power \(P\) of the flash in watts can be calculated by dividing the total energy \(E_{total}\) by the duration of the flash (\(0.10\) s). Hence, \(P = E_{total} / 0.10\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Energy of a Photon
The concept of the energy of a photon is crucial to understanding electromagnetic radiation and quantum physics. A photon, which is a particle of light, carries energy as it travels through space. This energy can be described using the equation \( E = hf \), where \( E \) is the energy of the photon, \( h \) is Planck's constant, and \( f \) is the frequency of the photon.

Planck's constant, a fundamental value in quantum mechanics, is approximately 6.626 x \(10^{-34}\) joule seconds. The frequency \( f \) of the photon can be determined based on the light's wavelength and the speed of light using the formula \( f = \frac{c}{\lambda} \). The energy of the photon is then calculated in joules (J). The higher the frequency, the more energy each photon carries, and conversely, the longer the wavelength, the less energy each photon contains.
Planck's Constant
Planck's constant is a fundamental parameter in quantum mechanics named after Max Planck, the physicist who introduced the idea of quantization in energy. The value of Planck's constant is exactly 6.62607015 x \(10^{-34}\) joule seconds (Js). It signifies the scale at which quantum effects become significant.

When multiplied with the frequency of light, as in the \( E = hf \) formula, it gives us the energy of an individual photon. Thus, it is a bridge between the macroscopic and microscopic worlds and is key to calculating photon energy and related phenomena such as those observed in bioluminescent organisms like dinoflagellates.
Light Wavelength
Wavelength is a fundamental characteristic of electromagnetic waves, including visible light. It is defined as the distance between consecutive points that are in phase, such as the spacing between crests or troughs in a wave. The wavelength \( \lambda \) is typically measured in meters (m), but for light, it's common to use nanometers (nm), where 1 nm equals \(10^{-9}\) m.

The wavelength of light determines its color, for instance, 460 nm is close to the blue part of the spectrum. Since wavelength is inversely related to frequency \( f \) by the relation \( f = \frac{c}{\lambda} \) where \( c \) is the speed of light (approximately \(3.0 \times 10^8\) m/s), knowing the wavelength allows us to calculate the photon's frequency and therefore its energy.
Photon Frequency Calculation
The frequency of a photon refers to the number of wave cycles that pass a given point per second and is measured in hertz (Hz). The frequency is determined by dividing the speed of light \( c \) by the wavelength \( \lambda \), using the formula \( f = \frac{c}{\lambda} \).

For a dinoflagellate emitting light at 460 nm, firstly, convert the wavelength to meters (\
Flash Power Calculation
Calculating the power of a flash of light from a bioluminescent dinoflagellate involves working out the total energy emitted and dividing it by the time interval over which the flash occurs. Given \(E_{total}\), the total energy of all photons emitted, and \( \triangle t\), the duration of the flash, the power \(P\) is the total energy per unit time, or \( P = \frac{E_{total}}{\triangle t} \).

After finding the energy of a single photon, multiply it by the total number of emitted photons (in this case, 100,000,000) to get \(E_{total}\). Then, divide by the duration of the flash (0.10 seconds) to calculate the power in watts (W), which essentially quantifies the rate at which energy is being emitted by the bioluminescent organism during its flash.

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Most popular questions from this chapter

What is the de Broglie wavelength of a red blood cell with a mass of \(1.00 \times 10^{-11} \mathrm{g}\) that is moving with a speed of \(0.400 \mathrm{cm} / \mathrm{s} ?\) Do we need to be concerned with the wave nature of the blood cells when we describe the flow of blood in the body?

In a photoelectric-effect experiment, the maximum kinetic energy of electrons is \(2.8 \mathrm{eV}\). When the wavelength of the light is increased by \(50 \%,\) the maximum energy decreases to \(1.1 \mathrm{eV}\) What are (a) the work function of the cathode and (b) the initial wavelength?

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