The energy density of starlight in interstellar space is 10–15 J/m3. If the average wavelength of...

The energy density of starlight in interstellar space is 10–15 J/m3. If the average wavelength of starlight is 500 nm, what is the corresponding density of photons per cubic meter of space? (photons/m3)

Expert Solution

queen_honey_blossom answered 8 months ago

Find the wavelength (in nm) of a photon whose energy is 9.00 × 10-19 J.

1.- A) A proton of cosmic ray in interstellar space has an energy of 7.50 MeV...

1.- A) A proton of cosmic ray in interstellar space has an energy of 7.50 MeV and executes a circular orbit of radius equal to that of Mercury's orbit around the Sun (5.80 x 1010 m). What is the magnetic field in that region of space? a 9.648e-031 T b 2.295e + 010 T c None of the above d 2.699e-012 T e 6.822e-012 T B) A circular coil of 55.00 turns and 1.00 cm radius can be oriented in...

.) At the average density of the interstellar medium, 1 atom per cm3, how big a...

.) At the average density of the interstellar medium, 1 atom per cm3, how big a volume of material must be used to make a star with the mass of the Sun? What is the radius of a sphere this size? Express your answer in light-years.

1. A state has an energy = 76.5×10−21 J and a degeneracy of 15. What is the...

1. A state has an energy = 76.5×10−21 J and a degeneracy of 15. What is the free energyof the state at 25◦C and at 150◦C? Express your answer in kJ/mol. 2. A molecule has a bond that can rotate between the cis and trans states, both of whichhave zero entropy. It is found that the trans state is three times more common than thecis state when the temperature is 250 K. If the molecule is heated to 450 K, what...

Solid particles (diameter 1.5 x 10-4 m, average density = 2800 kg/m3) are settling in water...

Solid particles (diameter 1.5 x 10-4 m, average density = 2800 kg/m3) are settling in water at 30 °C. The properties of water at this temperature are viscosity (µ) = 8 x 10-4 kg/m.s and density (p) = 996 kg/m3 a) What is the terminal velocity for the particles? b) What would be the velocity of the system in a separator with an acceleration of 390 m/s2?

An average ping pong ball has a radius of r=0.019m and an average density of p=84kg/m3....

An average ping pong ball has a radius of r=0.019m and an average density of p=84kg/m3. The density of air is p=1.225kg/m3. a) what is the magnitude and direction in unit vector notation of the force required to hold it completely submerged in water? b) while still completely submerged , what is the difference in pressure between the top and bottom of the ball? C) if released, the ball will eventually find itself floating on the surface. What percent of...

Q =10, 15 m3/s and the slope will be S = 15 cm/km and the side...

Q =10, 15 m3/s and the slope will be S = 15 cm/km and the side slope, so Z =1. For a trapezoidal channel, given the flow rate, Q, the slope, S, the side slope, Z, n = 0.014, the channel is to be designed to have minimum cost. You are required to: a) What is the value of Q and S? b) What is the ratio of bottom width, b, to flow depth, y? c) Design and draw the...

The density of gasoline is 7.30 ✕ 102 kg/m3 at 0°C. Its average coefficient of volume...

The density of gasoline is 7.30 ✕ 102 kg/m3 at 0°C. Its average coefficient of volume expansion is 9.60 ✕ 10−4 (°C)−1, and note that 1.00 gal = 0.00380 m3. (a) Calculate the mass of 8.3 gal of gas at 0°C. (Give your answer to at least two decimal places.) ____kg (b) If 1.000 m3 of gasoline at 0°C is warmed by 20.5°C, calculate its new volume. (Give your answer to at least two decimal places.) ____m3 (c) Using the...

A solid cylinder of radius 1.5 m has a uniform volume charge density of 15 C/m3....

A solid cylinder of radius 1.5 m has a uniform volume charge density of 15 C/m3. Find the magnitude of the electric field at 1.25 m from the axis of the cylinder. a) what will your gaussian surface be? Make a sketch of the solid cylinder and the gaussian surface with their radii b) Write an expression for the total electric flux through the gaussian surface, that is the LHS (Left hand side) of the Gauss' law (this expression may...

8)The density of gasoline is 730 kg/m3 at 0°C. Its average coefficient of volume expansion is...

8)The density of gasoline is 730 kg/m3 at 0°C. Its average coefficient of volume expansion is 9.60 10-4(°C)?1. Assume 1.00 gal of gasoline occupies 0.003 80 m3. How many extra kilograms of gasoline would you receive if you bought 10.3 gal of gasoline at 0°C rather than at 16.5°C from a pump that is not temperature compensated? 9)A mercury thermometer is constructed as shown below. The Pyrex glass capillary tube has a diameter of 0.003 80 cm, and the bulb...

Question