A point moves along the x axis according to the law x = a sin^2 (wt— π/4). Find:

(a) the amplitude and period of oscillations; draw the plot x (t);

(b) the velocity projection vx as a function of the coordinate x;draw the plot vx (x).

Anonymous User Physics Oscillation 28 Apr, 2020 83 views

A point oscillates along the x axis according to the law x = a cos (wt — π/4). Draw the approximate plots (a) of displacement x, velocity projection vx, and acceleration projection wx as functions of time t; (b) velocity projection vx and acceleration projection wx as functions of the coordinate x.

Anonymous User Physics Oscillation 28 Apr, 2020 75 views

Cellulose acetate is a?

Anonymous User Chemistry Polymers 28 Apr, 2020 67 views

Sum of real solutions of the equation  is?

Anonymous User Maths Quadratic Equation 27 Apr, 2020 61 views

Number of integral values of a for which (a + 2)x*x + 2(a + 1) x + a = 0 will have integer roots is/are

Anonymous User Maths Quadratic Equation 27 Apr, 2020 69 views

Number of real ordered pair (x,y) satisfying x*x +1=y and y*y +1=x is?

Anonymous User Maths Quadratic Equation 27 Apr, 2020 60 views

Let p,q be roots of the equation x*x -4x+A=0 and r and s be the roots of the equation x*x -20x+B=0.If p < q < r < s are in A.P., then (A, B) is

Anonymous User Maths Quadratic Equation 27 Apr, 2020 74 views

The number of integral value(s) of x satisfying the equation

Anonymous User Maths Quadratic Equation 27 Apr, 2020 64 views

The least integral value of 'a' such that (a-2)x*x +8x+a+4>0,

Anonymous User Maths Quadratic Equation 27 Apr, 2020 58 views

The set of values of 'p' so that both the roots of the equation (p-5)x*x -2px +(p-4)= 0 are positive,one is less than 2 and other is lying between 2 & 3, is

Anonymous User Maths Quadratic Equation 27 Apr, 2020 124 views

The number of integral values of ëmí less than 50 , so that the roots of the quadratic equation mx2 +(2m-1)x+(m-2)=0 are rational,are

Anonymous User Maths Quadratic Equation 27 Apr, 2020 60 views

if are the roots of the equation the equation whose roots are is

Anonymous User Maths Quadratic Equation 27 Apr, 2020 66 views

If a, b, c  and the quadratic equation has no real roots, then

Anonymous User Maths Quadratic Equation 27 Apr, 2020 61 views

The binding energy per nucleon of deuteron  and helium nucleus  is 1.1 MeV and 7 MeV respectively. If two deuteron nuclei react to form a single helium nucleus, then the energy released is

Anonymous User Physics Atomic Physics 27 Apr, 2020 72 views

A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2 : 1. What would be the ratio of their nuclear sizes?

Anonymous User Physics Atomic Physics 27 Apr, 2020 71 views

If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is

Anonymous User Physics Atomic Physics 27 Apr, 2020 62 views

The wavelengths involved in the spectrum of deuterium  are slightly different from that of hydrogen spectrum, because

Anonymous User Physics Atomic Physics 26 Apr, 2020 66 views

Which of the following atoms has the lowest ionization potential?

Anonymous User Physics Atomic Physics 26 Apr, 2020 61 views

In the nuclear fusion reaction,

given that the repulsive potential energy between the two nuclei is ~ 7.7 × 10-14 J, the temperature at which the gases must be heated to initiate the reaction is nearly

Note: Boltzmann's constant k = 1.38 × 10-23 J/K

Anonymous User Physics Atomic Physics 26 Apr, 2020 59 views

Which of the following cannot be emitted by radioactive substances during their decay?

Anonymous User Physics Atomic Physics 26 Apr, 2020 67 views

A nucleus with Z = 92 emits the following in a sequence:

The Z of the resulting nucleus is

Anonymous User Physics Atomic Physics 26 Apr, 2020 62 views

A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, what will be the decay constant (per minute)?

Anonymous User Physics Atomic Physics 26 Apr, 2020 63 views

When U238 nucleus originally at rest, decays by emitting an alpha particle having a speed u, the recoil speed of the residual nucleus is

Anonymous User Physics Atomic Physics 26 Apr, 2020 85 views

Which of the following radiations has the least wavelength?

Anonymous User Physics Atomic Physics 26 Apr, 2020 63 views

If N0 is the original mass of the substance of half­ life period t1/2 = 5 years, then the amount of substance left after 15 years is

Anonymous User Physics Atomic Physics 26 Apr, 2020 66 views

If 13.6 eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is

Anonymous User Physics Atomic Physics 26 Apr, 2020 66 views

At a specific instant emission of a radioactive compound is deflected in a magnetic field. The compound can emit

(i) electrons
(ii) protons
(iii) He2+
(iv) neutrons

The emission at the instant can be

Anonymous User Physics Atomic Physics 26 Apr, 2020 63 views

If gE and gM are the accelerations due to gravity on the surfaces of the earth and the moon respectively and if Millikan’s oil drop experiment could be performed on the two surfaces, then what would be the ratio

Anonymous User Physics Nuclear physics 25 Apr, 2020 64 views

Photon of frequency u has a momentum associated with it. If c is the velocity of light, the momentum is

Anonymous User Physics Nuclear physics 25 Apr, 2020 59 views

The anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows

Anonymous User Physics Nuclear physics 25 Apr, 2020 76 views

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV, and the stopping potential for a radiation incident on this surface 5 V. Where the incident radiation lies?

Anonymous User Physics Nuclear physics 25 Apr, 2020 68 views

What is the time by a photoelectron to come out after the photon strikes approximately?

Anonymous User Physics Nuclear physics 25 Apr, 2020 62 views

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor

Anonymous User Physics Nuclear physics 25 Apr, 2020 66 views

A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed (1/2) m away, the number of electrons emitted by photocathode would

Anonymous User Physics Nuclear physics 25 Apr, 2020 78 views

Explain APPENDICULAR SKELETOM ?

Anonymous User Biology 25 Apr, 2020 75 views

Types of HUMAN SKELETAL SYSTEM

Anonymous User Biology 25 Apr, 2020 77 views

Explain HUMAN SKELETAL SYSTEM

Anonymous User Biology 25 Apr, 2020 75 views

A charged oil drop is suspended in a uniform field of 3 × 104 V/m so that it neither falls nor rises. What will be the charge on the drop?

Note: mass of the charge = 9.9 × 10-15 kg and g = 10 m/s2

Anonymous User Physics Nuclear physics 25 Apr, 2020 66 views

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

Anonymous User Physics Nuclear physics 25 Apr, 2020 67 views

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal vs the frequency, of the incident radiation gives a straight line whose slope

Anonymous User Physics Nuclear physics 25 Apr, 2020 60 views

Two identical photocathodes receive light of frequencies f1 and f2. If the velocities of the photoelectrons (of mass m) coming out are respectively v1 and v2, then

Anonymous User Physics Nuclear physics 25 Apr, 2020 95 views

Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then what will be the ratio of the wavelengths?

Anonymous User Physics Nuclear physics 25 Apr, 2020 74 views

The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is

Anonymous User Physics Electromagnetic Waves 25 Apr, 2020 68 views

An electromagnetic wave of frequency  = 3.0 MHz passes from vacuum into a dielectric medium with permittivity  = 4.0. Then

Anonymous User Physics Electromagnetic Waves 25 Apr, 2020 63 views

Consider telecommunication through optical fibres. Which of the following statements is not true?

Anonymous User Physics Electromagnetic Waves 25 Apr, 2020 67 views