During alpha decay, helium nuclei (alpha particles) are emitted from the nucleus.

Beta decay involves the emission of beta particles, which are electrons or positrons.

Gamma radiation is the most penetrating type of radiation.

A material with a very small band gap behaves like a semiconductor, allowing some charge carriers to be thermally excited.

Doping silicon with phosphorus creates an n-type semiconductor due to the extra electrons contributed by phosphorus.

Sound waves are longitudinal waves, where the particle displacement is parallel to the direction of wave propagation.

In a transverse wave, the particle motion is perpendicular to the direction of wave propagation.

A vibrating string produces transverse waves, where the displacement of the medium is perpendicular to the direction of wave propagation.

A tuning fork produces longitudinal waves, where the displacement of the medium is parallel to the direction of wave propagation.

A tuning fork produces longitudinal waves in the air as it vibrates back and forth, creating compressions and rarefactions.

A tuning fork produces longitudinal waves in air, where the particles of the medium vibrate parallel to the direction of wave propagation.

A tuning fork produces longitudinal waves, as the vibrations cause compressions and rarefactions in the air.

Sound is classified as a longitudinal wave, where the particle displacement is parallel to the direction of wave propagation.

Adding a surfactant to water decreases the surface tension by disrupting the cohesive forces between water molecules.

The acceleration of the center of mass of a wheel rolling down an incline is g sin(θ).

The point of contact with the ground is momentarily at rest when the wheel rolls without slipping.

The distance traveled by the center of mass d is equal to the product of the radius R and the angle rotated θ in radians, i.e., d = Rθ.

In division, the result should have the same number of significant figures as the quantity with the least significant figures. 100.0 has 4 significant figures and 4.00 has 3 significant figures, so the result should have 3 significant figures: 25.0.

The answer should have 3 significant figures, as 25.0 has the least significant figures.

The result should have the same number of significant figures as the measurement with the least significant figures, which is 2.0 (1 significant figure).

In division, the result should have the same number of significant figures as the factor with the least significant figures. 6.022 x 10^23 has 4 significant figures and 2.0 has 2 significant figures, so the answer should have 2 significant figures.

The result should have the same number of significant figures as the measurement with the least significant figures, which is 2.5 (2 significant figures).

In multiplication, the result should have the same number of significant figures as the factor with the least significant figures. 3.00 has 3 significant figures and 2.5 has 2 significant figures, so the answer should have 2 significant figures.

The result should have 2 significant figures, as 2.5 has the least significant figures.

In multiplication, the result should have the same number of significant figures as the factor with the least significant figures. 3.00 has 3 significant figures and 2.5 has 2 significant figures, so the answer should have 2 significant figures.

The result should have 2 significant figures, as 2.5 has the least significant figures.

In multiplication, the result should have the same number of significant figures as the factor with the least significant figures. 3.24 has 3 significant figures and 2.1 has 2 significant figures, so the answer should have 2 significant figures.

Rounding to three significant figures gives 0.00457.

When rounding to three significant figures, 0.6789 becomes 0.679.

In subtraction, the result should be rounded to the least number of decimal places. 100.5 has one decimal place, so 200 - 100.5 = 99.5.