A guitar creates sound waves of different pitches when the strings are plucked. How do the sound waves of the higher-pitched notes compare to the sound waves of the lower-pitched notes?
A
The sound waves of notes with higher pitches travel at slower speeds.
B
The sound waves of notes with higher pitches have lower amplitudes.
D
The sound waves of notes with higher pitches have higher
frequencies.
The sound waves of notes with higher pitches have higher
wavelengths.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

the maxium height is 34m/s