Answer:
Resistor
Explanation:
Resistor provides resistance to the flow of electric current in a circuit.
It controls the amount of current in a circuit by acting as a barrier to the flow of electric charges
That depends on the wavelength itself, like what type of wave it is and where on the spectrometer it is
Answer:
A
Explanation:
Snell's law states:
n₁ sin θ₁ = n₂ sin θ₂
where n is the index of refraction and θ is the angle of incidence (relative to the normal).
The index of refraction of air is approximately 1. So:
1 sin 30° = 1.52 sin θ
θ ≈ 19°
Answer: Option (e) is the correct answer.
Explanation:
There are three types of kinetic energy which are vibrational, rotational and translational kinetic energy.
A plucked string on a guitar will produce sound and it represents vibrational kinetic energy.
The moving blades of a ceiling fan shows the rotation of blades and it represents rotational kinetic energy.
A spinning top also displays rotation therefore, it represents rotational kinetic energy.
A tuning fork struck on a rubber block will produce sound and it will vibrate. Therefore, it represents vibrational kinetic energy.
An apple falling from a tree shows that apple is linearly falls on the ground therefore, it represents translational kinetic energy.
Thus, we can conclude that an apple falling from a tree is the best example which represents translational kinetic energy.
Answer:
C and D
Explanation:
Galaxies are composed of stars, dust and dark matter, all held together by gravity. Astronomers aren't certain exactly how galaxies formed. After the Big Bang, space was made up almost entirely of hydrogen and helium.
