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HF is the weakest acid because of it's strong H-F bond. Fluorine being small in size overlaps better with 1s orbital of hydrogen leading to a strong bond. Hence can not give proton easily. Here bond strength overweighs the electronegativity of F .As we go down the group, size of the halogens increases.This results in poor overlap of it's orbital with 1s orbital of hydrogen making the H-X bond weaker. H-I bond is the weakest of all , so it is the strongest acid.

A hollow cylinder has length L and inner and outer radii a and b. It is made of a material with resistivityρρ. A potential difference is set up between the inner and outer surfaces of the cylinder, each of which is an equipotential surface) so that current flows radially through the cylinder. What is the resistance to this radial current flow?

THIS IS A GENERAL FORMULA DERIVATION for RESISTANCE IN THIS CASE.

substitute the given value of respective radii and get the solution.

The nuclear force is the force that binds the protons and neutrons in a nucleus together. This force can exist between protons and protons, neutrons and protons or neutrons and neutrons. This force is what holds the nucleus together.

Properties:(i) It is attractive in nature but with a repulsive core. That is the reason that the nucleus is held together without collapsing in itself.

(ii) The range of nuclear force is very short. At 1 Fermi, the distance between particles in a nucleus is extremely small. At this range, the nuclear force is much stronger than the repulsive Coulomb’s force that pushes the particles away. However, if the distance is anything more than 2.5 Fermi, nuclear force is practically non-existent.

(iii) The nuclear force is identical for all nucleons. It does not matter if it is a neutron or proton, once the Coulomb resistance is taken into consideration, nuclear force affects everything in the same way.

(iv) At a distance less than 0.7 Fermi, this force becomes repulsive. It is one of the most interesting properties of nuclear force, as this repulsive component of the force is what decides the size of the nucleus. The nucleons come closer to each other till the point that the force allows, after which they cannot come any closer because of the repulsive property of the force.

nuclear force are 2 types nuclear fusion and fission

nuclear fusion - when 2 atoms are applied force to join it which produces a huge amount of electricity than fission

fission - when 1 atom are separated into two and produces energy

The forward voltage at which the current through the PN junction starts increasing rapidly is known as knee voltage.It is also called as cut-in –voltage or threshold voltage.The knee voltage for a silicon diode is approximately 0.7 volt and for a germanium diode 0.3 volt.

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it doesn't look clear

c) is correct answer

This question can be done even without knowing the concept!!Just use dimensional analysis!!Like, I am not telling to use it everytime, but sometimes, this trick helps!!!

=15×18/5=3×18=54km/hr

Given: 15m/s

15 m/s×3.6=54km/hr

=15×18÷5=270÷5=54km/hr

Latent heat is the amount of thermal energy, per mole, that must be added to a substance to change its state from solid to liquid or liquid to gas, or the energy given off in going the other direction, in every case at constant temperature. It’s called “latent” because it’s a latent property of the substance which originates from the collective structure of the atoms or molecules, for example, ice going to water requires energy to break the intermolecular bonds keeping H2O in a solid state, and water going to steam requires still more energy to break the (weaker) liquid-state intermolecular bonds.

Distance travelled by the wave =6 x 8 = 48m

Time taken = 10s

Speed = 48/10

=4.8m/s

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Conductivity (or specific conductance) of an electrolyte solution is a measure of its ability to conduct electricity. The SI unit of conductivity issiemenspermeter(S/m).

Definition of Resonance - "The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system."

A frequencycapable of exciting aresonancemaximum in a given body or system.

Resonance, An object free to vibrate tends to do so at a specific rate called the object's natural, or resonant, frequency. ... This phenomenon is called resonance. Through resonance, a comparatively weak vibration in one object can cause a strong vibration in another.

Resonance, An object free to vibrate tends to do so at a specific rate called the object's natural, or resonant, frequency. ... This phenomenon is called resonance. Through resonance, a comparatively weak vibration in one object can cause a strong vibration in another.

Resonance. In sound applications, a resonant frequency is a natural frequency of vibration determined by the physical parameters of the vibrating object. ... It is easy to get an object to vibrate at its resonant frequencies, hard to get it to vibrate at other frequencies

Hybrid parameters are also referred as h parameters.

These are referred as hybrid because, here Z parameters, Y parameters, voltage ratio, current ratio, all are used to represent the relation between voltage and current in a two port network.

During the process of mass m being added and the disc rotating making less revolutions the thing which remains constant is Angular momentum.So we need to conserve angular momentum.

FormomentofinertiaIandangularvelocityωandangularfrequencyvIω=Iν=constantorI1ω1=I2ω2orLetmomentofinertiaofdiscbeI,wehavebeengiventhefrequencyas90rev.persecWhenmassmisbeingaddedweuseparallelaxistheorumsofinalmomentofinertiawith60rev.persecbecomes(I+mr^2).SoI×90=(I+mr^2)×603I=2I+2mr^2I=2mr^2

Given that the mole fraction of ethanol-water system is 0.25

i.e. solution contains 0.25 mol EtOH and 0.75 mol H2O

Mol wt of EtOH is 46.06 g/mol Therefore 0.25 mol = 11.515 gof EtOH

Mol wt of H2O is18.01528 g/mol There fore 0.75 mol =13.51 g ofH2O

Total weight = 25.02646 gms

Wt % of EtOH is 11.515 / 25.02646 x 100 =46.011 %

30° is the correct answer of the given question

AngleC is theangle of reflection(anglebetween thereflectedray and the normal). ... (Note that theangle of incidenceis not30 degrees; it is 60degreessince theangle of incidenceis measured between the incident ray and the normal.)

(a) sodium chloride

sodium chloride is not capable of sublimating.

A+B = (3+5)i+(-1+1)j+(7+9)k = 8i+0j+16k

so, direction cosine m = cos∅ = 0/√8²+16² = 0

the number of turn is 024

resultant forcef1=12f2=3f3=13.74FN=F1+F2+F3 = -12+3+13.74 = 4.74this is the resultant force

4.74 N is the correct answer of the given question

To get higher resistance. connect three resistors of 3 ohm in series

And lowest one in parallel

And lowest one in parallel ??

Anideal simple pendulumis a point mass attached with massless, flexible and inextensible string suspended from a rigid support.

Apendulumis a weight suspended from apivotso that it can swing freely.When a pendulum is displaced sideways from its resting,equilibrium position, it is subject to arestoring forcedue togravitythat will accelerate it back toward the equilibrium position. When released, the restoring force acting on the pendulum's mass causes it tooscillateabout the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called theperiod. The period depends on the length of the pendulum and also to a slight degree on theamplitude, the width of the pendulum's swing.

Highest Resistance is when it is connected in seriesR=R1+R2+R3+R4Lowest Resistance is when it's connected in parallel1/R=1/R1+1/R2+1/R3+1/R4

fossil fuel is not obtained in the destructive destillation of food

Watt and horse power are units of power and a option is not valid . so answer is d option that is none of these.