The error is the absolute difference between the measured value and the true value, which is |20.0 - 19.5| = 0.5 cm.

The error in measurement is the difference between the true value and the measured value, which is 100 - 95 = 5.

In a dihybrid cross, the expected genotypic ratio in the F2 generation is 9:3:3:1.

The expected ratio of phenotypes in a cross between two purebred parents with contrasting traits is 1:1 in the F1 generation when they are crossed with each other.

The pistil is the female reproductive part of the flower, consisting of the ovary, style, and stigma.

Using the mirror formula, 1/f = 1/v + 1/u; here, v = -10 cm (real image) and u = -30 cm (object distance). Thus, 1/f = 1/(-10) + 1/(-30) = -1/6, so f = 5 cm.

Using the mirror formula, 1/f = 1/v + 1/u. Here, v = -15 cm (real image) and u = -30 cm (object distance). Thus, 1/f = 1/(-15) + 1/(-30) = -1/10, so f = -10 cm.

Using the mirror formula, 1/f = 1/v + 1/u. Here, v = -15 cm (image distance is negative for concave mirror) and u = -30 cm. Therefore, 1/f = 1/(-15) + 1/(-30) = -1/10. Thus, f = 10 cm.

Absolute error is calculated as the difference between the measured value and the true value.

The average power (P) in an AC circuit is given by P = VI cos(φ), where φ is the phase difference between voltage and current.

The density of a crystalline solid is calculated using the formula Density = mass/volume.

The formula for calculating the heat energy required to change the temperature of a substance is Q = mcΔT, where m is mass, c is specific heat capacity, and ΔT is the change in temperature.

The formula for calculating heat transfer due to conduction is Q = kA(T1-T2)/d, where k is the thermal conductivity, A is the area, and d is the thickness.

The formula for calculating the heat transfer in a substance is Q = mcΔT, where Q is the heat added, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The impedance (Z) in an RLC series circuit is calculated using the formula Z = √(R^2 + X^2), where X is the total reactance.

The induced EMF in a coil is given by the formula E = -dΦ/dt, where Φ is the magnetic flux.

In a face-centered cubic unit cell, there are 4 atoms (1/8 from each of the 8 corners and 1/2 from each of the 6 faces).

The correct formula is moles = mass / molar mass.

The formula for calculating the number of moles is moles = mass / molar mass.

Number of moles = Molarity x Volume (in liters).

The formula for work done (W) is W = Fd cos(θ), where F is the force, d is the displacement, and θ is the angle between the force and displacement.

The formula for kinetic energy (KE) is KE = 1/2 mv², where m is mass and v is velocity.

The formula for inductive reactance is X_L = 2πfL, where f is the frequency and L is the inductance.

The magnetic field (B) at the center of a circular loop is given by B = μ₀I/2r.

Freezing point depression = i * Kf * m = 2 * 1.86 * 1 = 3.72 °C (i = 2 for NaCl).

Freezing point depression = Kf * m = 1.86 °C kg/mol * 1 mol/kg = 1.86 °C.

Freezing point depression = i * Kf * m = 3 * 1.86 * 3 = 5.58 °C (i = 2 for KCl).

Frequency (f) can be calculated using the formula f = v/λ. Here, f = 340 m/s / 2 m = 170 Hz.

Frequency (f) can be calculated using the formula f = v/λ. Here, f = 10 m/s / 2 m = 5 Hz.

Frequency (f) can be calculated using the formula f = v/λ. Here, f = 340 m/s / 2 m = 170 Hz.