NEET JEE Physics Notes Quiz Tricks PDF

✅ Concave Mirrors:
By reflection of light, concave mirrors give real, inverted images if the object is beyond the focus and a virtual, erect, enlarged image if the object has a distance less than the focal length from the pole of the mirror.

👉🏻 Uses of Concave Mirrors:
➖ Concave mirrors are used in torches, searchlights, and headlights of vehicles to get powerful parallel beams of light.
➖ Concave mirrors are also used as shaving mirrors to see a larger image of the face.
➖ Dentists use concave mirrors to see bigger images of the teeth of the patients.
➖ Large concave mirrors are used to focus sunlight to produce heat in the solar furnaces.


✅ Convex Mirrors:
By the reflection of light convex Mirrors always give a virtual, erect, diminished image of the object kept infront of the mirror.

👉🏻 Uses of Convex Mirrors:
➖ The convex mirror is used as a side-view mirror in vehicles to give a smaller view of the vehicles coming from behind.
➖ They are used in shops and supermarkets and any other place where there is a requirement for detecting burglars.
➖ Convex mirrors are used in making lenses for sunglasses.
➖ Convex mirrors are used in magnifying glasses, and telescopes.
➖ Convex mirrors are used to reflect street light; because they can reflect over a wide area.
➖ Convex mirrors are kept at the street corners to avoid collisions.

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💠Terminologies in Progressive Wave Motion💠

➖Amplitude
➖Period
➖Wavelength
➖Frequency
➖Wave velocity
➖Phase or phase angle (O)
➖Phase difference
➖Path difference
➖Time difference


🔹Amplitude (A): The amplitude of a wave is the maximum displacement of any particle of the medium from its equilibrium position.

🔹Period (T): Period (T) of a wave is the time taken by any particle of the medium to complete one vibration during a period (T).

🔹Wavelength (λ): Wavelength (λ) is equal to the distance between two consecutive particles of the medium which are in the same state of vibration it is equal to the distance travelled by the wave by its time period (T).

🔹Frequency (f): It is the number of vibrations made per second by any particles of the medium (f = 1/T). Since the frequency of a wave is a characteristic property of the source which is producing the wave motion, hence, the frequency of a wave does not change when a wave travels from one medium to another medium.

🔹Phase or Phase Angle (Φ): It represents the state of vibration of the particle of a medium with respect to its mean position.

🔹Phase Difference Δ(Φ): It represents the different state of vibration of a particle at two different instants (or) any pair of particles at the same instant. ΔΦ = Φ2 – Φ1.

Wave Velocity (v): It is the distance travelled by the wave in one second (v = λ/T). It is determined by the mechanical properties of the medium through which the wave propagates. The velocity of wave motion is measured with respect to the medium, the wave velocity changes when the medium is in motion i.e. speed of sound through air changes when the wind is blowing.

⇒ Check: Sound Waves

There are two velocities associated with a wave. One is the wave velocity and the other one is particle velocity (which is the speed with which the particle of the medium vibrate when the wave passes through the medium).

🔹Path Difference (Δx) or (x): It indicates the distance between two points measured along the direction of propagation of the wave through the medium.

🔹Time Difference (ΔT): It indicates the time taken by the wave to travel from one point to another through the medium.

Oscillation Handwritten Notes

🏷 Semiconductor Short Notes ™

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ℙ𝕝𝕒𝕟𝕔𝕜'𝕤 ℚ𝕦𝕒𝕟𝕥𝕦𝕞 𝕋𝕙𝕖𝕠𝕣𝕪
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❖ Substances that absorb or emit light discontinuously in the form of small packets or bundles.

❖ The smallest packet of energy is called quantum (plural quanta).

❖ The radiation is propagated in the form of waves.

❖ The energy of a quantum is directly proportional to the frequency of the radiation

E ∝ v
E = hv
E = (hc)/ λ =hc v

Where E = Energy of radiation
h = Planck's constant
= 6.626 * 10^-27 * erg .sec
= 6.626 * 10^-34 Joule.sec

❖ A body that can absorb or emit energy in whole number multiple of quantum.

E = nhv

Where n = 1, 2, 3, 4

❖ The frequency of emitted radiation goes from lower to higher as the temperature increases.

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