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23 Nov 2019

A widely used “short-wave” radio broadcast band is referred to asthe “49-meter band”. What is the frequency of a 49-m radiosignal?

---Should I use the same equation (f = c/λ) for this equation... Iguess I don't see how to apply it.

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Irving Heathcote
Irving HeathcoteLv2
30 Jul 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

 Please solve all of these equations  as early as possible. 

1 .

(a) The distance to a star ts approximately
  4.21 x 10^18 m. If this star were to burn out         today, in how many years would we see it

disappear?

(                            )years

(b) How long does it take sunlight to reach Earth?
(                           )minutes .

(c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth

to the Moon is 3.84 x 10^5 km }
(                    )s.

2. Which of the following statements are true regarding electromagnetic waves traveling through a vacuum?
(Select all that apply }.
1.All waves have the same wavelength. 

2.All waves have the same frequency 

3.All waves travel at 3.00 x 10° m/s 

4. The electric and magnetic flelds associated with the waves are perpendicular to each other and to the direction of wave propagation .


5.The speed of the waves depends on their frequency. 


3.What are the wavelength ranges for the following? 

(a) the AM radio band (540-1600 kHz)

  1.maximum wavelength(              ) m.

  2.minimum wavelength (              ) m.

(b)  the FM radio band (88-108 Mhz) 

maximum wavelength  (                  )m.

minimum wavelength  (                   )m.

4. What are the wavelengths of electromagnetic wave in free space that have the following frequencies? 
(a) 2. 00 x 10^19 Hz 

      (                 )pm.

(b) 7.50 x 10^9 Hz 

    (                     )cm. 


5.A diathermy machine used In physiotherapy generates electromagnetic radiation that gives the effect of "deep heat” when absorbed In tissue One assigned frequency for diathermy ts 915. 00 MHz, What is the wavelength of this radiation?
 
linear mass density (                         )m.

Part 2 is here :

http://www.cramster.com/answers-nov-10/physics/rotating-pendulum-part-2-rotating-pendulum-part-ii-note-part-httpww_1015121.aspx

This is the same rotating pendulum of the previous two problems.Now it is time to analyze the different types of motion andequilibrium (according to the initial conditions).
Note: The “effective potential” method is a powerful tool to analyzeand solve problems where the Hamiltonian is conserved. A similartechnique is used for central potentials, including the Keplerproblem of celestial mechanics (two-body gravitationalproblem)—will see that later.
(a) Let us call Eeff ≡ H the “effective energy.” To make it look likea real energy, define Eeff = T2 + Veff , where Veff should include therelevant non-quadratic piece of kinetic energy (which effectivelybehaves, with an appropriate sign, as a potential energycontribution). In short, the effective potential is defined so thatthe effective kinetic energy left in the Hamiltonian is justquadratic.
Your task: Find the corresponding effective potential Veff (θ), i.e.,write it down explicitly as a function of θ.
Hint: Using the resolution T = T0 + T1 + T2 , it should follow thatVeff = V − T0 (using
Euler’s theorem for homogeneous functions).
(b) Analyze all possible shapes of the graph of the effectivepotential Veff (θ) (versus θ). For this purpose, simply use calculusand the techniques for energy graphs that we studied withone-dimensional systems. Specifically, you should plot Veff (θ) andfind the extrema.
Hint: There should be two different regimes (or two “families” ofshapes).
(c) At what rotation rate ωc does the stationary point at θ = 0become unstable?
(d) For ω > ωc , what is the stable equilibrium value ofθ?
Explain the physical meaning of this stable “dynamic equilibrium”value. Also explain in simple terms why θ = 0 is a stable “dynamicequilibrium” position for ω < ωc .
(e) What is the frequency Ω of small oscillations about the“dynamic equilibrium” points (for each of the two regimesdiscovered above)? Compute this frequency in two differentways:
(i) using the effective potential; and (ii) linearizing the equationof motion.

A steel wire in a piano has a length of 0.6000 m and a mass of5.100*10^-3 kg. To what tension must this wire be stretched inorder that the fundamental vibration correspond to middle C (fC =261.6 Hz on the chromatic musical scale)?

F=?, L=0.6000 m, m=5.100*10-3 kg, n=0.50031N whereg=9.81m/s2, fc=261.6 Hz

I honestly can not figure out where to begin. I believe this isa standing waves problem so I'm almost positive that it should usethe following equation, but I can not figure out a properderivative or manipulation of the equation to find a seeminglycorrect answer.

fn= (n/2L)*√(F/μ) where n=the number of harmonic(1,2,3...)

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