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3 years ago

Which best describes a radioactive isotope?

Physics

2 answers:

goldenfox [79]3 years ago

5 0

I think its A because t<span>he nuclei of some isotopes are unstable and emit radiation.</span>

sveta [45]3 years ago

4 0

Answer: Option (A) is the correct answer.

Explanation:

An isotope with an unstable nucleus which decomposes readily and results in the emission of radiation and a nuclear electron or helium nucleus achieves a stable nuclear composition is known as a radioactive isotope.

For example, $^{210}_{84}Po \rightarrow ^{4}_{2}He + ^{206}_{82}Pb$

Here isotope of polonium decomposes in order to achieve a stable nuclear composition.

Thus, we can conclude that an atom is unstable best describes a radioactive isotope.

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A plastic light pipe has an index of refraction of 1.48. For total internal reflection, what is the minimum angle of incidence i

Rama09 [41]

Answer:

a) 42.52°

b) 63.98°

Explanation:

Refractive index of pipe = 1.48 = n₂

Refractive index of air = 1.0003 = n₁

$\theta_r=sin^{-1}\frac{n_1}{n_2}\\\Rightarrow \theta_r=sin^{-1}\frac{1.0003}{1.48}\\\Rightarrow \theta_r=sin^{-1}0.676\\\Rightarrow \theta_r=42.52^{\circ}$

∴ Minimum angle of incidence is 42.52°

Refractive index of water = 1.33 = n₁

$\theta_r=sin^{-1}\frac{n_1}{n_2}\\\Rightarrow \theta_r=sin^{-1}\frac{1.33}{1.48}\\\Rightarrow \theta_r=sin^{-1}0.899\\\Rightarrow \theta_r=63.98^{\circ}$

∴ Minimum angle of incidence is 63.98°

5 0

4 years ago

A 1.00 x 109 kg object is raised vertically at a

DerKrebs [107]

Answer:

P = 3.92 10¹⁰ W

Explanation:

The power is data by the expression

P = W / t

the work of a force is

W = F. y

the bold ones represent vectors. In this case the displacement is vertical upwards and the vertical forces upwards, therefore the angle is zero and the cos 0 = 1

W = F y

we substitute

P = F y / t

P = F v

as the body rises at constant speed the acceleration is zero and from the equilibrium condition

F -W = 0

F = mg

we substitute

P = m g v

let's calculate

P 1.00 10⁹ 9.8 4

P = 3.92 10¹⁰ W

5 0

3 years ago

What happens to the inertia of an object of its mass is decreased?

Verizon [17]

<span>The inertia of an object increases if the mass is decreased. Inertia is the resistance of any physical object to a change in its state of motion or rest. It is represented numerically by an object's mass.</span>

3 0

4 years ago

How does the wavelength emitted by an object relate to its temperature?

OlgaM077 [116]

Explanation:

I haven't actually seen the answer I'm looking for but I think the answer is when temperatures are lower the wavelength is longer

8 0

3 years ago

The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements corre

krek1111 [17]

Answer:

The correct option is;

(b) The end A of the solenoid behaves like a north pole

Explanation:

According to Lenz's law we have that the induced emf direction in the solenoid due to the rapid introduction of the bar magnet will be such that the electric current induced will have a resultant magnet field that will oppose to the movement of the north pole of the bar magnet that resulted in the magnetic field

Therefore, the opposing magnetic pole to the north pole of a magnet is a north pole and the solenoid end A will act like the north pole.

5 0

3 years ago