Explanation

Explanation

Two waves of unequal amplitude do not cause stationary waves.

Stationary waves are formed when two waves of equal amplitude, frequency, and speed travel in opposite directions and interfere with each other.

Explanation

The incorrect statement is "Distance between consecutive nodes is 1 wavelength."

The distance between consecutive nodes is actually 1/2 wavelength, as nodes are points of no displacement in standing waves.

It occurring at intervals of half the wavelength along the string.

Explanation

The expression (1-v^2/c^2)^-0.25 is always greater than one because it represents the Lorentz factor, which accounts for time dilation and length contraction in special relativity.

Explanation

• Charge: Q=1mC=1×10^−3C

• Voltage: $V = 100,text{V}$

• The formula for capacitance is:

C=Q/V​

Calculation:

$$C = frac{1 times 10^{-3}}{100} = 1 times 10^{-5},text{F} = 10,mutext{F}$$

Explanation

Explanation

Explanation

If the current is into the page and the wire is perpendicular to the page, then the magnetic field will be directed counterclockwise.

Explanation

In a pure (intrinsic) semiconductor:

• The number of electrons in the conduction band is equal to the number of holes in the valence band.

• As a result, the Fermi level lies midway between the conduction band and the valence band.

• This midpoint represents the energy level at which the probability of finding an electron is 50% at absolute zero.

This is a key difference from doped (extrinsic) semiconductors, where the Fermi level shifts depending on the type of doping (n-type or p-type).

Explanation

In a conductor, the electric field inside the conductor (in the material itself) must be zero. So:

The inner surface of the shell must carry a charge that exactly cancels the field from the charge inside the cavity.

Since there's a –3 C charge at the center, the inner surface must have a charge of +3C to neutralize the field inside the conductor.