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3 years ago

Each element has an atomic number state which is meant by atomic number

1 answer:

3 0

Answer: The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons. The number of protons in an atom is called its atomic number. This number is very important because it is unique for atoms of a given element. All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.

Explanation:

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Calculate the wavelength of an electron (m = 9.11 × 10-28 g) moving at 3.66 × 106 m/s.

valina [46]

The answer is 1.99 × 10⁻¹⁰ m.

To calculate this we will use De Broglie wavelength formula:
λ = h/(m*v)
λ - the wavelength
h - Plank's constant: h = 6.626 × 10⁻³⁴ Js
v - speed
m - mass

It is given:
λ = ?
m = 9.11 × 10⁻²⁸ g
v = 3.66 × 10⁶ m/s

After replacing in the formula:
λ = h/(m*v) = 6.626 × 10⁻³⁴ /(9.11 × 10⁻²⁸ * 3.66 × 10⁶) = 1.99 × 10⁻¹⁰ m

6 0

3 years ago

Read 2 more answers

To determine power, it is necessary to know the A. energy required and the time it takes. B. amount of work and the distance cov

Y_Kistochka [10]

The answer for this would be A. since power is Joules/seconds and energy is rated in Joules

5 0

4 years ago

Read 2 more answers

An object that completes 100 vibrations in 5 seconds has a period of

fenix001 [56]

<h2>Answer: None of the above choices are correct.</h2>

Explanation:

Here we are talking about the vibration frequency of an object:

$f=\frac{100vibrations}{5s}$ (1)

The frequency $f$ is defined as the inverse of the period $T$ (time):

$f=\frac{1}{T}$ (2)

Therefore the Period is:

$T=\frac{1}{f}$ (3)

Now, if we want to find the period we have to substitute equation (1) in equation (3):

$T=\frac{1}{\frac{100}{5s}}$

$T=\frac{5s}{100}$

Finally:

$T=0.05s$ >>>>This is the value of the period, which does not match with any of the options given.

Hence:

None of the above choices are correct.

6 0

3 years ago

Read 2 more answers

We want to hang a thin hoop on a horizontal nail and have the hoop make one complete small-angle oscillation each 2.0 s. What mu

Mama L [17]

Answer:

Explanation:

Given that the hoop makes one complete oscillation in 2s, this implies that the period of oscillation is 2s

Then,

T = 2s

Let Mass of the thin hoop be M

Let Radius of the hoop be R

Moment of inertial of a hoop is

I = MR²

Period of a physical pendulum of small amplitude is given by

T = 2π √(I / Mgd)

Where,

T is the period in seconds

I is the moment of inertia in kgm²

M is the mass of the hoop

g is the acceleration due to gravity

g = 9.8m/s²

d is the distance from rotational axis to center of of gravity

Therefore, d = R

Then, applying the formula

T = 2π √ (I / MgR)

So, we know that

I = MR²

Then,

T = 2π √( MR² / MgR)

T = 2π √(R/g)

Make R subject of formula

Square both sides

T² = 4π²(R/g)

T²g = 4π²R

Then, R = T²g / 4 π²

Since g = 9.8m/s² and T= 2s

R = 2² × 9.8 / 4π²

R = 0.993m

Then, the radius of the hoop is 0.993m

3 0

3 years ago

How does a plasma form?

ankoles [38]

Plasma is formed by increasing the temperature of a gas until the electrons within have enough energy to break free of the positive force of attraction exhibited by the nucleus.

5 0

3 years ago