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white, perfectly reflecting surface, it exerts a 4. (10) When an radiation pressure p on that...
2. Electromagnetic waves can exert force on objects because they carry momentum. A common laser pointer...
2. Electromagnetic waves can exert force on objects because they carry momentum. A common laser pointer has a power rating of P and a cross-sectional radius of r. a. What is the intensity, I, of the laser pointer? For simplicity, we say that the energy distribution is uniform. b. What is the radiation pressure, p, if the laser pointer is aimed directly at a perfectly reflecting surface? c. What is the force, F, the laser beam exerts on a perfectly...
Two light beams of different frequency and same intensity fall on a black and white surfaces
33. Two light beams of different frequency and same intensity fall on a black and white surfaces, striking perpendicular to the surface. Which of the following statements is/are true? a. the white surface experiences twice the change in momentum of the black surface. b. The light beams exert no pressure on any of the surfaces because light is just energy. c. Both beams exert the same pressure on the surfaces. d. The high-frequency beam exerts more pressure on the surfaces. 34. Which of the following...
Constants In this example we will investigate the viability of using radiation pressure to propel a...
Constants In this example we will investigate the viability of using radiation pressure to propel a spacecraft. Suppose a spacecraft with a mass of 2.50 x 10 kg has a solar sail made of perfectly reflective aluminized film with an area of 2.59 x 106 m2 (about 1 square mile). If the spacecraft is launched into earth orbit and then deploys its sail at right angles to the sunlight, what is the acceleration due to sunlight? (At the earth's distance...
Question 10 Statistical thermodynamics may be used to find the radiation pressure P for cavity (or...
Question 10 Statistical thermodynamics may be used to find the radiation pressure P for cavity (or black body) radiation in terms of the energy per unit volume u. (a) An ideal quantum gas comprises non-interacting identical particles with discrete quantum states labelled 1, 2, ...,r ,....The partition function is given by Z (T,V,N)- > exp(-B(n,&, + п,&, +...)} пп. (i) Define the symbols n1, n2,...,n,...and 81, 82, ..., Er,... (iiExplain why, for photons, the partition function may be expressed as:...
Electromagnetic radiation is incident on a metallic surface. Electrons are emitted from the surface when the...
Electromagnetic radiation is incident on a metallic surface. Electrons are emitted from the surface when the wavelength is 450 nm or less. a) What is the work function of the metal? b) What is the maximum kinetic energy of photo-electrons if the incident light has a wavelength of 400 nm? c) What is the stopping voltage required to stop photo-electrons ejected by the plate when the incident light has a wavelength of 300 nm? d)If the stopping voltage is 5...
A possible means of space flight is to place a perfectly reflecting aluminized sheet into orbit a...
A possible means of space flight is to place a perfectly reflecting aluminized sheet into orbit around the Earth and then use the light from the Sun to push this "solar sail." Suppose a sail of area A 5.9010 m2 and mass m 4,800 kg is placed in orbit facing the Sun. Ignore all gravitational effects and assume a solar intensity of 1,370 W/m2 (a) What force (in N) is exerted on the sail? (Enter the magnitude.) 4.47 If you...
When a box rests on a round sheet of wood on the ground, it exerts an...
When a box rests on a round sheet of wood on the ground, it exerts an average pressure p on the wood. If the wood is replaced by a sheet that has four times the diameter of the original piece, what is the new average pressure? a) 16p b) 4p c) 8p d) p/8 O e) p/16 Of p/4 Next Page Page 2 of 13
Radiation heat transfer: Two perfectly black surfaces (each with emissivity ε = 1.0) are constructed such...
Radiation heat transfer: Two perfectly black surfaces (each with emissivity ε = 1.0) are constructed such that all the radiant energy leaving a surface at 800 °C (1073 K) reaches the other surface. The temperature of the other surface, with area A = 2 m2, is maintained at 250 °C (523 K). Using the formula Q = ε σ A (THot4 – TCold4) calculate the heat transfer (in kW) of the surface maintained at 800 °C. The Stefan-Boltzmann constant, σ...
every question on a solo paper 1) 4. A charged particle A exerts a force of...
every question on a solo paper
1) 4. A charged particle A exerts a force of 2.62 uN to the right on charged particle B when the particles are 13.7 mm apart. Particle B moves straight away from A to make the distance between them 17.7 mm. What vector force does it then exert on A? 1) 4. A charged particle A exerts a force of 2.62 uN to the right on charged particle B when the particles are 13.7...
3.5-total number of ways in which 4 balls can be selected out of 6 white and...
3.5-total number of ways in which 4 balls can be selected out of
6 white and 9 black balls = 15P4 = 32760
Number of ways in which 4 balls can be selected where first 2
are white and last 2 black = 6P2*9P2 = 2160
Thus, required probability = 2160/32760 =
0.0659
3.16)
Let the event that baby survives delivery be denoted by B
and the event that C section is performed be denoted by C
P(B) = 0.98,...
2. Electromagnetic waves can exert force on objects because they carry momentum. A common laser pointer has a power rating of P and a cross-sectional radius of r. a. What is the intensity, I, of the laser pointer? For simplicity, we say that the energy distribution is uniform. b. What is the radiation pressure, p, if the laser pointer is aimed directly at a perfectly reflecting surface? c. What is the force, F, the laser beam exerts on a perfectly...
Constants In this example we will investigate the viability of using radiation pressure to propel a spacecraft. Suppose a spacecraft with a mass of 2.50 x 10 kg has a solar sail made of perfectly reflective aluminized film with an area of 2.59 x 106 m2 (about 1 square mile). If the spacecraft is launched into earth orbit and then deploys its sail at right angles to the sunlight, what is the acceleration due to sunlight? (At the earth's distance...
Question 10 Statistical thermodynamics may be used to find the radiation pressure P for cavity (or black body) radiation in terms of the energy per unit volume u. (a) An ideal quantum gas comprises non-interacting identical particles with discrete quantum states labelled 1, 2, ...,r ,....The partition function is given by Z (T,V,N)- > exp(-B(n,&, + п,&, +...)} пп. (i) Define the symbols n1, n2,...,n,...and 81, 82, ..., Er,... (iiExplain why, for photons, the partition function may be expressed as:...
A possible means of space flight is to place a perfectly reflecting aluminized sheet into orbit around the Earth and then use the light from the Sun to push this "solar sail." Suppose a sail of area A 5.9010 m2 and mass m 4,800 kg is placed in orbit facing the Sun. Ignore all gravitational effects and assume a solar intensity of 1,370 W/m2 (a) What force (in N) is exerted on the sail? (Enter the magnitude.) 4.47 If you...
When a box rests on a round sheet of wood on the ground, it exerts an average pressure p on the wood. If the wood is replaced by a sheet that has four times the diameter of the original piece, what is the new average pressure? a) 16p b) 4p c) 8p d) p/8 O e) p/16 Of p/4 Next Page Page 2 of 13
every question on a solo paper
1) 4. A charged particle A exerts a force of 2.62 uN to the right on charged particle B when the particles are 13.7 mm apart. Particle B moves straight away from A to make the distance between them 17.7 mm. What vector force does it then exert on A? 1) 4. A charged particle A exerts a force of 2.62 uN to the right on charged particle B when the particles are 13.7...
3.5-total number of ways in which 4 balls can be selected out of
6 white and 9 black balls = 15P4 = 32760
Number of ways in which 4 balls can be selected where first 2
are white and last 2 black = 6P2*9P2 = 2160
Thus, required probability = 2160/32760 =
0.0659
3.16)
Let the event that baby survives delivery be denoted by B
and the event that C section is performed be denoted by C
P(B) = 0.98,...
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