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agasfer [191]
4 years ago
13

Which electromagnetic waves have the shortest wavelength and the highest frequency?

Physics
2 answers:
Mariulka [41]4 years ago
7 0
Gamma Rays.

Hope this helps!
Flauer [41]4 years ago
3 0

Answer:

Gamma rays

Explanation:

The distance between two consecutive crests or trough is called the wavelength of electromagnetic wave. The number of oscillations per unit time is called the frequency of the wave.

There exists an inverse relationship between the frequency and the wavelength as

v = υ × λ    

Where

v is the speed of wave

υ is the frequency of wave

λ is the wavelength of the wave

So, the wave having shortest wavelength will have highest frequency. Gamma rays have shortest wavelength and the highest frequency. Its wavelength is approximately 10^{-13}\ m and its frequency is 10²¹ Hz.            

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Find the kinetic energy of an electron whose de broglie wavelength is 34.0 nm.
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The De Broglie wavelength of the electron is
\lambda=34.0 nm=34 \cdot 10^{-9} m
And we can use De Broglie's relationship to find its momentum:
p= \frac{h}{\lambda}= \frac{6.6 \cdot 10^{-34} Js}{34 \cdot 10^{-9} m}=1.94 \cdot 10^{-26} kg m/s

Given p=mv, with m being the electron mass and v its velocity, we can find the electron's velocity:
v= \frac{p}{m}= \frac{1.94 \cdot 10^{-26} kgm/s}{9.1 \cdot 10^{-31} kg}=  2.13 \cdot 10^4 m/s

This velocity is quite small compared to the speed of light, so the electron is non-relativistic and we can find its kinetic energy by using the non-relativistic formula:
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3 years ago
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3 years ago
Lance arrives early at the airport (with flowers and balloons in hand) to welcome a friend. Her plane is delayed. While waiting,
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A satellite omass1000 kg moves in a circular orbit of radius 8000 km round the earth,assumed to be a sphere of radius 6400 km. C
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Answer:

ΔE = 37.8 x 10^9 J

Explanation:

The energy required will increased the potential energy and increase the kinetic energy.

As the altitude change is fairly small compared to the earth radius, we can ASSUME that the average gravity will be a good representative

Gravity acceleration at altitude would be 9.8(6400²/8000²) = 6.272 m/s²

G(avg) = (9.8 + 6.272)/2 = 8.036 m/s²

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The centripetal force at orbit must be equal to the gravity force

mv²/R = mg'

v²/8.0e6 = 6.272

v² = (6.272(8.0e6)) = 50.2e6 m²/s²

The maximum velocity when resting on earth at the equator is about 460 m/s.

The change in kinetic energy is

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