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3 years ago

What is the wavelength of an electron that has a kinetic energy of 0.50 MeV (relativistic)?

Physics

1 answer:

NikAS [45]3 years ago

3 0

Answer:

The wavelength of electron is $6.99\times 10^{-22}\ m$

Explanation:

The kinetic energy of the electron is, $E=0.5\ MeV=0.5\times 10^6\ eV$

We need to find the wavelength of this electron. It can be calculated using the concept of DE-broglie wavelength as :

$\lambda=\dfrac{h}{\sqrt{2mE} }$

h is Plank's constant

m is the mass of electron

$\lambda=\dfrac{6.67\times 10^{-34}\ J-s}{\sqrt{2\times 9.1\times 10^{-31}\ kg\times 0.5\times 10^6\ eV} }$

$\lambda=6.99\times 10^{-22}\ m$

So, the wavelength of electron is $6.99\times 10^{-22}\ m$ . Hence, this is the required solution.

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PLEASE HELP ME WITH THIS ONE QUESTION

ki77a [65]

Answer:

B) The current of the entire circuit is lowered.

Explanation:

There are two ways in which a resistor can be connected in a circuit;

i) Series: In a series connection, resistors are connected end to end. In this arrangement, the current passing through each resistor is the same while the potential difference across each resistor is different.

ii) Parallel: In a parallel connection, resistors are connected to common junctions. In this arrangement, the potential difference across each resistor is the same while the current across each resistor varies.

In a series circuit, the effective resistance is the algebraic sum of resistance of all the resistors connected in series. Hence, if a large resistor is connected in series, the effective resistance of the circuit is greatly increased.

Since the voltage is given by;

V=IR (Ohm's law)

Where R is the effective resistance

Then;

I = V/R

If R becomes very large due to a large resistance connected in series, then the current of the entire circuit is lowered.

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3 years ago

Constructive and destructive interference of vibrational waves on an aircraft can create a range of effects from a slight tail f

horrorfan [7]

Answer:

A. True

Explanation:

This is because these aircraft experiences different types of vibrations which include buffet vibrations and aerodynamic flutter. Buffet vibrations are vibrations caused by an interruption of airflow. Buffet vibrations are usually felt when the aerodynamic brakes are applied.

Aeroelastic flutter is the most dangerous type of vibration. This occurs when energy added to the wings due to airflow is greater than that lost due to damping. Aeroelastic flutter can cause aircraft to fail when the vibrations are large enough.

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2 years ago

Two objects attract each other with a gravitational force of magnitude 1.02 10-8 N when separated by 19.7 cm. If the total mass

Yakvenalex [24]

Answer:

mass 1 = 1.60kg

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3 years ago

Read 2 more answers

The units we use to measure the sound intensity level are _____.

Sergio039 [100]

Answer:

decibels (dB)

Explanation:

The sound intensity level is a quantity derived from the sound intensity.

The intensity of a wave is defined as the power of the source of the wave divided by the area through which the power of the wave is spread, mathematically:

$I=\frac{P}{A}$

where

P is the power of the source

$A=4\pi r^2$ is the surface area over which the wave spreads (assuming that the wave propagates in all directions, it corresponds to the surface area of a sphere of radius $r$ , where r is the distance between the source of the wave and the observer)