Sound waves, like light waves, can interfere w/ each other, giving max and min levels of sound. Suppose a listener standing directly between 2 loudspeakers hears the same tone being emitted from both. This listener observes that when one of the speakers is moved 0.16 m farther away, the...
Analogous to the uncertainty relation ΔpΔx > h/4π, there is an uncertainty relation for the time and energy, ΔEΔt > h/4π that stems from the methods
usually used to measure the energy. The uncertainty in the time, Δt, can be interpreted as a lifetime. The excited state of an atom responsible...
Hi,
Thanks for helping me answer this question. I do understand that hemophilia is a sex linked disease and that it is linked to the X-chromosome. I also see that the results of the gels show that clearly, all the members of the pedigree who are affected are clearly homozygous recessive for...
Hi I have a question about PCR markers. I have attached an image of both a pedigree and a gel showing the genotypes of a family with a history of hemophilia, an X-linked recessive disease.
The question I am trying to answer is whether the PCR marker used appear to be linked to the diseased...
Question: Calculate the De Broglie wavelength for a hydrogen atom at room temperature (300K).
So far, the only equation I know/have used for De Broglie wavelength is lambda=h/(mv). However, I am not exactly sure how to incorporate the information that the hydrogen atom is at room temperature...
Homework Statement
The first few lines of the Balmer series for atomic hydrogen lie at the wavelengths λ = 656.46, 486.27, 434.17, 410.29nm, ... Find a value for RH, the Rydberg constant for hydrogen. The ionization energy I is the minimum energy required to remove the electron. Find it from...
In the classical wave theory of light, intensity was associated with the squares of the
maximum amplitudes of the electric and magnetic fields. In the particle theory of light, what
property is associated with the intensity of the light?
I know that according to the particle theory, the...
Here is a really simple conceptual question.
Explain why ultrasound can be used to prove the size and position of the fetus inside the mother's abdomen. Could audible sound with a frequency of 8000 s-1 be used for this purpose?
I know that audible sound has too low of a frequency (i.e not...
Hi, below is a question from my first quantum mechanics homework. I haven't taken quantum mechanics before and I don't how to approach the question exactly. For part a, I believe I can use the equation Emax=1/2mv^2=hv-hvo. vo=binding energy. For the minum wavelength of light, do I assume the...
Well I know the equation for period is T=2pi(L/g)^(1/2) however, 2pi and the length are constants, and g, acceleration due to gravity, I believe won't really remotely change to any notable degree so I don't see why the period changes.
1. a. Jim and Gina are swinging on adjacent swings of equal length. Jim weighs about twice as much as Gina. Who takes less time to swing back and force.
I got this answer, which is that they take the same time since mass doesn't affect the period in simple harmonic motion. However, I don't get...
A potter has a stone disk of radius 0.483 m and mass 101 kg rotating at 71.9 rev/min. The potter stops the wheel in 6.54 seconds by applying a wet towel against the rim with a radially inward force of 103 N. Find the effective coefficient of kinetic friction between the whell and the wet towel...
A floodlight with a mass of 40 kg is used to
illuminate the parking lot in front of a library.
The floodlight is supported at the end of a
horizontal beam that is hinged to a vertical
pole, as shown. A cable thatmakes an angle of
11◦ with the beam is attached to the pole to
help support...
A potter's wheel is 101 kg and has radius of 0.483 meters and is freely rotating at 71.9 rev/min. the potter can stop the wheel in 6.54 s by pressing against the rim and exerting a radially inward force of 103 N. find coefficient of kinetic friction.
I found alpha=71.9 x 2 x pi/60sec/ 6.54=...
3 forces act on an object. If the object is in translational equilibrium, which of the following must be true?
1. the vector sum of the forces =0
2. the magnitude of the 3 forces must be equal
3. the 3 forces must be parallel
would the answer be just 1? I don't think 2 is true because...