What were the difficulties in producing blue LEDs and the benefits of this achievement?

Q: Review Multiple-Concept Example 7 in this chapter as an aid in solving this problem. In a fast-pitch…

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Q: Sometimes you can see the 'rainbow' in a thin layer of oil on the ground. Explain why this happens.…

A: The rainbow pattern is due to the interference due reflection of light from the two ends of the…

Q: At t = 0, the bob of a simple pendulum is displaced to the right by an angle e_0 = +0_max/√2 and is…

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Q: . What is the mass of an iron sphere whose diameter is 58 cm? The density of iron is 7.9 x 10³…

A: Given data:  Diameter of the iron sphere (d) = 58 cm = 0.58 m Density of iron (ρ) = 7.9×103 kg/m3…

Q: PROBLEM 3 Determine the motion of the guiding center of a particle with mass m and charge q in the…

A: Consider a particle of mass m, charge q and revolving around a current carrying wire.   The magnetic…

Q: In the crude image of a slightly more advanced barometer (shown below), what does it mean if the…

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Q: 2.00 when the acceleration due to gravity is 9.80 m/s. Your design for the pendulum includes a small…

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Q: ... starting now! Suppose you have collected the set of data below by measuring the amount of time…

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Q: a) Suppose that the width and radius of curvature of a Gaussian beam of wavelength λ= 532 nm, at…

A: Given :    Wavelength, λ = 532 nm = 1×10-9 m    Beam width, W1 = 1 mm = 1×10-3 m    Radius, R1 = 1 m…

Q: 4. What type of particle is emitted in each nuclear reaction? a. 325i - ³2p b. 18F-180 C.…

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Q: A cyclist races around a circular track at the constant speed of 20 m/s. The radius of the track is…

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Q: A 28 kg child goes down a straight slide inclined 35° above horizontal. The coefficient of kinetic…

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Q: When monochromatic light of an unknown wavelength falls on a sample of aluminum, a minimum potential…

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Q: Position (km) 700 600 550 500 450 400 350 300 250 200 150 100 O 0 0 110 220 330 Position vs. Time…

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Q: true or false. Electrical conductivity in semiconductors and metals generally increase with…

A: Given : Electrical conductivity in semiconductors and metals generally increase with increasing…

Q: Before cutting a cable in a trench, how can a lineman be sure the correct cable has been isolated?

A: Step 1:The lineman can be sure of isolation by using a spike tool

Q: A ramp has been placed over the stairs at the entrance. The angle of the ramp is 20 degrees. How…

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Q: One billiard ball is shot east at 2 m/s. A second identical billiard ball is shot west at 1 m/s. The…

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Q: The highest recorded waterfall in the world is found at Angel Falls in Venezuela. Its longest single…

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Q: A magnetic dipole moment of m = (7.50, -8.38, 4.59) Am² is inside a uniform magnetic field of B =…

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Q: QUESTION 9 What would be the frequency of a wave in a material with a refractive index of 1.92, if…

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Q: A vehicle with headlights separated by 1.59 m approaches an observer holding an infrared detector…

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Q: The first evidence for the dark energy was that: a. the cosmic microwave background spectrum was a…

A: The first evidence for dark energy came in 1998 two teams of astronomers measured light coming from…

Q: I fill my car tires to 32 PSI in the summer, when the temperature is 25° C. In the winter, the…

A: The given data we have: Initial pressure: 32PSI =220632 Pa Initial temperature: 25oC=298K Final…

Q: A cyclist starts from rest and pedals such that the wheels of his bike have a constant angular…

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Q: To make a batch of cookies, you mix half a bag of chocolate chips into a bowl of cookie dough,…

A: Here's the information that we need to use: FF is the applied force vv is the speed ΔtΔt is the…

Q: An object of mass m is released from rest a distance R above the surface of a planet of mass M and…

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Q: A 0.75 kg mass oscillates according to the equation x(t)=Acos(ωt). Here, A=0.67 m and ω=6.5 rad/s.…

A: Mass= m = 0.75 kg Angular frequency=ω = 6.5 rad/s Amplitude= A= 0.67m Equation of the oscillator:-…

Q: A fan blade is rotating with a constant angular acceleration of +13.1 rad/s2. At what point on the…

A: Given data:  Angular acceleration (α) = +13.1 rad/s2 Tangential acceleration (a) = g = 9.8 m/s2…

Q: Count the number of 180° phase reversals for the interfering rays 1 and 2 in the following figures.…

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Q: As illustrated, A flat disk with a mass of 1.387 kg slides on a horizontal frictionless surface. The…

A: Given mass , m=1.387 kginitial velocity, vA=2.673 m/schord stiffness , k=8.112 N/minitial position,…

Q: You are investigating the internal energy of a system in the laboratory. You plot the PV diagram for…

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Q: As the summer intern for a company that manufactures nozzles for garden hoses, you are working on an…

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Q: Above. 20. Estimate the wavelength at which the Sun emits the most light. Assume that the average…

A: Temperature (T) = 5800 k

Q: An object of heigh 9 cm is placed 25 cm in front of a converging lens of focal length 10 cm. Behind…

A: height of object (h) = 9cm object distance (d) = 25 cm focal length of converging lens (f1) = 10 cm…

Q: 1.What will be the final velocity of an object having a mass of 12 kg if it moves by 12 meters while…

A: Given data: The mass, m=12 kg The force, F=50 N The distance, S=12 m

Q: A standard after-surgery intravenous fluid has a density of 1025 kg/m³. If during the first six…

A: Given: The density of the fluid is 1025 kg/m3. The volume of fluid is 1.08x10-3 m3. The time…

Q: What is the final velocity of a car originally traveling at 50.0 km/h that decelerates at a rate of…

A: Givenu=50 km/hr     or    13.89 m/sa=-0.400 m/s2t=50 si will use v=u+at

Q: On a spring morning (22°C) you fill your tires to a pressure of 2.15 atm. As you ride along, the…

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Q: How long will it take for the activity of an oxygen-15 sample to decrease from 9.8 × 10¹3 Bq to 2.2…

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Q: A man does 375 J of work by lifting some boxes to a height of 3 m. How much force has he used?

A: Let the force be  F We use the formula for work done W=Force ×displacement =Fh

Q: A youngster rides on a skateboard with a speed of 2m/s. After a force acts on the youngster, her…

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Q: 2. Write the nuclide notation for atoms with the following characteristics: a. 25 protons, 20…

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Q: Are there different types of black holes?

A: Since you have posted multiple questions, we will provide the solution only to the first question as…

Q: Question: How many molecules are present in a sample of an ideal gas that occupies a volume of 3.00…

A: We know, Ideal Gas Law. PV=NkBT Here  P=1 atm=101325 N/m2V=3 cm3=3×10-6 m3T=20o=293.15…

Q: Hooke's law describes a certain light spring of unstretched length 37.0 cm. When one end is attached…

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Q: One kind of cuckoo clock keeps time by using a mass bouncing on a spring, usually something cute…

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Q: girl and boy are moving a wagon full of books across the floor at a constant speed, as shown below.…

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Q: 3.Assume a skydiver, whose mass is 67 kg, experiences 213 N of air resistance.  What is the…

A: GivenMass of skydiver, m=67 kgair resistance, F1=213 Nwe need to calculate acceleration of…

Q: Many aspects of a gymnast's motion can be modeled by representing the gymnast by four segments…

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The Bohr model

Students often get confused between Rutherford’s model and Bohr model of an atom. They interpret the postulates of both these models to be the same, which is incorrect. Rutherford’s model differs from Bohr’s model in the following ways: