Explanation

A principle in physics that states that energy can neither be created nor destroyed and that the total energy of a system by itself remains constant.

Explanation

According to Newton's 2nd law, the object's acceleration and centripetal force are in the same direction.

Explanation

By joining two hemispheres along their bases we have a sphere.

Total surface area of sphere = 4×πr2

Explanation

The EMF induced across the ends of a wire moving through a magnetic field can be calculated using the formula:

E = Blv

Where:

• E is the induced EMF in volts
• B is the magnetic flux density in teslas
• l is the length of the wire in meters
• v is the velocity of the wire in meters per second

Given:

B = 0.10 T

l = 0.20 m

v = 3.0 m/s

Substituting the values into the formula, we get:

E = 0.10 x 0.20 x 3.0

E = 0.06 V

Explanation

• At the end of a communication system, such as a radio receiver or a phone, the signal is converted from radio waves (electromagnetic waves) to sound waves, which are perceived as sound by the human ear.
• This conversion is done through a speaker or earphone, which converts the electrical signal into sound waves.

Explanation

Electrons are accelerated by voltages up to 10^9 V in order to find the internal structure of a nucleus.

Explanation

• High-speed electrons from particle detectors are used to determine the diameter of atomic nuclei through techniques such as electron scattering or electron microscopy.
• By measuring the scattering pattern or the diffraction pattern of the electrons, researchers can infer the size and shape of the atomic nucleus, including its diameter.

Explanation

Wavelength of slow moving neutrons is about 10^-10 m.

Explanation

• A stone whirling in a horizontal circle on the end of a string is a classic example of a conical pendulum, a type of physical system that demonstrates principles of circular motion, centrifugal force, and angular momentum.
• The string traces out a cone-shaped path, hence the name "conical pendulum".
• This is different from a simple pendulum, which swings back and forth in a vertical plane.

Explanation

• Electrons exhibit diffraction effects because their de Broglie wavelength is similar to the spacing between atomic layers in a crystal.
• The de Broglie wavelength of an electron is given by λ = h/p, where h is Planck's constant and p is the electron's momentum.
• For electrons in a crystal, this wavelength is typically in the range of 0.1-1 nanometers, which is similar to the spacing between atomic layers in the crystal.
• As a result, electrons interact with the crystal lattice and exhibit diffraction effects, such as bending around corners or passing through the crystal in specific directions.