Explanation

Wavelength is a measure of distance between two wave crests or troughs.

The SI unit for measuring distance is the meter (m), hence it is used for wavelength.

It is typically denoted by the symbol λ (lambda).

Explanation

When a book is stationary, the upward normal force from the table equals the downward gravitational force.

These balanced forces result in no motion, keeping the book at rest.

Explanation

The speed of sound is higher in solids (like glass and iron) than in liquids (like water) and gases (like dry air).

However, the speed of sound in glass is less than in iron because iron is denser and has a higher elasticity.

Explanation

The fundamental units in the SI (International System of Units) are:

1. The meter (m) for length,
2. The kilogram (kg) for mass,
3. The second (s) for time,
4. The ampere (A) for electric current,
5. The kelvin (K) for thermodynamic temperature,
6. The mole (mol) for the amount of substance, 
7. The candela (cd) for luminous intensity.

These seven base units are independent and form the foundation of the SI system, from which all other units are derived. 

Explanation

Tectonic plate movements create pressure and cracks in the Earth's crust.

This allows magma to rise and cause volcanic eruptions.

Explanation

The refractive index of glass typically ranges from 1.5 to 1.9, depending on the type of glass.

Standard crown glass has a refractive index of approximately 1.5.

Explanation

 Surface tension acts like a "skin" on the water, pulling the molecules at the surface inwards, which naturally leads to a spherical shape as it minimizes the surface area

Explanation

Conduction occurs when heat is transferred through direct contact between particles.

It mostly happens in solids, especially metals, which are good conductors.

Explanation

Sharp knives have a smaller contact area, so the same force creates greater pressure.

Higher pressure allows the knife to cut through materials more easily.

Explanation

Steam causes more severe burns than boiling water because it carries latent heat of vaporization.

It releases extra energy when it condenses on the skin.