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3 years ago

What can help a scientist identify any object in a group of objects?

Physics

2 answers:

sineoko [7]3 years ago

5 0

Answer:

C- The objects characteristics

Explanation:

I just did it

NNADVOKAT [17]3 years ago

4 0

Answer:The object characteristics

Explanation:the objects characteristics

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Ryan is playing with a ball. When would the ball<br> have the greatest polential energy?

forsale [732]

When the ball is not moving

7 0

4 years ago

Davisson and Germer performed their experiment with a nickel target for several electron bombarding energies. At what angles wou

pochemuha

Answer:

The angle of diffraction are 67.75 deg and 53.57 deg.

Explanation:

Given:

Davisson and Germer experiment with nickel target for electrons bombarding.

Voltages : $38\ eV$ and $54\ eV$

We have to find the angles that is $\phi_3_8$ and $\phi_5_4$ .

Concept:

Davison Germer experiment is based on de Broglie hypothesis where it says matter has both wave and particle nature.
When electrons get reflected from the surface of a metal target with an atomic spacing of $D$ , they form diffraction patterns.
The positions of diffraction maxima are given by $Dsin(\phi) = n\lambda$ .
An atomic spacing is $D = 0.215\ nm$ , when the principal maximum corresponds to n=1
The wavelength is $\lambda$ , and $\lambda =\frac{1.227 \sqrt{V} } {\sqrt{V_o}}\ nm$ .

Solution:

Finding the wavelength at $V_o=38\ eV$ .

⇒ $\lambda_3_8 =\frac{1.227 \sqrt{V} } {\sqrt{38V}}\ nm$

⇒ $\lambda_3_8 =0.199$ nm

Plugging the values of wavelength.

⇒ $sin(\phi)=\frac{\lambda}{D}$

⇒ $\phi_3_8=sin^-1(\frac{0.199}{0.215} )$

⇒ $\phi_3_8 =67.75$ degrees.

Now

For for the electrons with energy $54\ eV$ , $V_0=54V$ the wavelength is.

⇒ $\lambda_5_4 =\frac{1.227 \sqrt{V} } {\sqrt{54V}} = 0.173$ nm

And

⇒ $\phi_5_4=sin^-1(\frac{0.173}{0.215} ) = 53.57$ degrees.

So,

The angles of diffraction maxima are 67.75 deg and 53.57 deg.

6 0

3 years ago

Explain why a sound becomes louder as you move closer to the source of the sound.

Marizza181 [45]

Answer:

The wavelength of frequency of the sound are closer to each other

The frequency of the sound increases as it moves towards you

6 0

3 years ago

PLS ANSWER FAST WILL GIVE BRAINLY!!!! ONLY IF YOU KNOW!!!

Aleks [24]

Answer:

30 neutrons

Explanation:

A neutral iron atom contains 26 protons and 30 neutrons plus 26 electrons in four different shells around the nucleus. As with other transition metals, a variable number of electrons from iron's two outermost shells are available to combine with other elements.

5 0

3 years ago

A long, straight wire of radius R carries a steady current I that is uniformly distributed through the cross section of the wire

vitfil [10]

Answer:

When $r \ge R$