What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 94.0% absorbed, puts 540 J of energy into a circular spot 2.20 mm in diameter in 4.00 s? Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2) and the implications it would have if the laser beam entered your eye. Note how your answer depen

Q: Consider the electromagnetic radiation inside a kiln, with a volume of 1 m3 and a temperature of…

A: Volume, V=1 m3 Temperature, T=1500 K Total energy of this radiation,  U=8π5kT415hc3V where, k is…

Q: If the energy received by 5 m² area in 560 seconds is 2880 KJ. Calculate the value of Solar constant…

A: Introduction :   In this question we are provided with value of area , time and energy. With these…

Q: The intensity of solar radiation at the top of Earth’s atmosphereis 1 370 W/m3. Assuming 60% of the…

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Q: Radiology. An x-ray tube has an output intensity of 2.6 mR/mAs at 100-cm source-to-image receptor…

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Q: The mean distance between the Earth and the Sun is 1.50 x 10 m. The average intensity of solar…

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Q: Consider a 4-m * 4-m * 4-m cubical furnace whose floor and ceiling are black and whose side surfaces…

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Q: A light source radiates isotropically with a power of 1500 W. The maximum intensity of the electric…

A: The intensity,I is defined as I=P4πR2               (1) where, P is the power in Watt and R is the…

Q: If emissivity of the body is equal to 1 and Stefan constant= 5.7x10-8 watt/m?. k°. when a person is…

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Q: A community plans to build a facility to convert solar radiation to electrical power. The community…

A: Given, Required power = 2.6 MW Efficiency = 30% Intensity of sunlight = 1200W/m2 We need to…

Q: A current of (1.124x10^0) A is used to charge a parallel plate capacitor with square plates. The…

A: According to Maxwell , conduction current in wire and displacement current(i) between plate of…

Q: An earth-orbiting satellite has solar energy–collecting panels with a total area of 4.0 m2 . If the…

A: Given:  Total area=4m2therefore, Power=solar constant×area.Where, solar constant…

Q: A co-worker of mine was once installing sheet-styrofoam insulation in the walls of his new garage.…

A: We know the relation connecting the voltage, work done and charge. Which is given by;…

Q: A medical researcher is using a chromium-51 source to study red blood cells. The…

A: Given:- The The gamma emission  at a distance of d1 =  1.0 m The  intensity is I1 = 0.75 mrem/s· m 2…

Q: The conductivity of a plasma is purely imaginary given by o = ioo. Therefore, J = ioo E If the…

A: Given: conductivity of plasma is iσ0  J→ = iσ0E→ Electric field - E→ = E0eikz-ωti^ To Find:…

Q: A B-emitting radiation source gives 250 units of radiation at a distance of 4.0 m. At what distance…

A: We know thatPower per unit area is called intensity.I=PAArea  is given by…

Q: he count rate for a particular a source X is C0 on a detector placed 1 m from the source. When a…

A: Given that: x=5 mm C=(1-0.75) C0=0.25C0

Q: The human body has a surface area of approximately 1.8 m2, a surface temperature of approximately…

A: Given: The area A = 1.8 m2. The temperature T = 30 0C =303 K. Emissivity e = 0.97.

Q: A co-worker of mine was once installing sheet-styrofoam insulation in the walls of his new garage.…

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Q: A housing attached to a microprocessor uses radiator fins to get rid of excess heat. If the largest…

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Q: NASA is giving serious consideration to the concept of solar sailing. A solar sailcraft uses a…

A: P=Power output of the Sun=3.9×1026 Wc=Speed of light=3×108 m/sm=Mass of solar sail=10000 kgM=Mass of…

Q: (a) What is the wavelength (in nm) of radiation that has an energy content of 2.43 × 10³ kJ/mol x 10…

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Q: If the frequency of radiation is doubled then the relation between initial K.E. and new K.E. is, (a)…

A: To find-New (K.E.)2=?Given-Initial frequency=(v)New frequency=2vInitial K.E.=(K.E.)1

Q: For the location 32 N in November 2 if transmission coefficient t is 0.6 and the diffuse radiation…

A: Let Id be defined as the direct beam solar radiation. Therefore, Id=CIbN=CAexp-Bcosθz Here, IbN is…

Q: Solar radiation reaches Earth at a rate of about 1,400 W/m2. If all this energy were absorbed, what…

A: Intensity (I ) = 1400 W/m2 Area (A) = 1 m2  All the energy is absorbed completely .

Q: A radiometer has two square vanes (2.0 cm by 2.0 cm), attached to a light horizontal cross arm, and…

A: Given information: Here, I is the light’s intensity.

Q: The energy flux associated with solar radiation incident on the outer surface of the earth's…

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Q: Q.22: If the frequency of radiation is doubled then the relation between initial K.E. and new K.E.…

A: The new frequency is twice the initial frequency.  ν2=2ν1

Q: Emergency responders for radioactive material incidents normally use the inverse square law of…

A: The inverse square law states that the intensity of any radioactive source decreaseswith the square…

Q: True or False UV light have a high ability to move through materials such as glass, paper, pus,…

A: True or False

Q: A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current…

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Q: (a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in…

A: a) The rate of heat transfer is given as, Qnet=σeAT24-T14=5.67×10-8×0.9×12.74-(15+273.1)4=-351.56 W

Q: Ch 24, Problem 31 The power radiated by the sun is 3.9 × 1026 W. The earth orbits the sun in a…

A: Given information:Power emitted by the sun (P0) = 3.9 × 1026 WRadius of earth orbit (R) = 1.5 × 1011…

Q: (a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in…

A: a) The rate which heat transfer through radiation is, Therefore,

Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.