Physics Answers

Write down the dimensions of the following quantities: work, impulse, density, coefficient of viscosity, power, modulus of elasticity

Find graphically and analytically the resultant of the following displacements A 10m northwest B 20m30° north of east C 35m due south

According to Kirchoof second law, When the negative potential increase in a closed circut then the positive potential in the same closd circuit.........

(Increase-Decrease)

2. A metal block of mass M kg is attached to a spring of negligible mass and spring constant k as shown in Fig. 2, and is free to slide on a frictionless, horizontal surface. A clay ball of mass M/4 kg is fired at the block with velocity V m/s and sticks to it. The block is initially at rest and the spring is initially uncompressed.

(a) (3 marks) What is the speed of the block and ball system immediately after the impact?

(b) (4 marks) Write an equation for the position of the block as a function of time after the collision, assume that at t = 0 s, the instant of the impact, it is at X = 0 m, which is the unstretched point of the spring. Determine values for the amplitude, angular frequency in terms of the given quantities. Assume that X and V are positive to the left as shown.

(c) (3 marks) Calculate the time period, maximum velocity, and maximum acceleration of the motion of the spring block and ball system.

Derive schrodingers equation

Write the salient features of free electron theory

In an optics laboratory, a researcher has performed Young's double slit experiment with two coherent beams with each wavelength of 2.0 mm. They both travel 4 cm to a detector, but one passes through air while the other through an unknown liquid of refractive index of 2.0

a) Do they cause constructive or destructive interference ?

b) Suppose if you replace the given liquid with other liquid of refractive index 2.5, will you get the same answer? Justify your answer

10. A single slit 1.0 mm wide is illuminated by 450 nm light. What is the central maximum (in cm) width in the diffraction pattern on a screen 5.0 m away?

A. 3 cm

B. 0.8 cm

C. 0.45 cm

D. 0.5 cm

7. Which of the following accurately defines diffraction?

A. Where waves like light or sound spread out as they move around an object or

through a slit

B. Where waves like light or sound bunch together as they move around an object

or through a slit.

C. Where waves like light of sound move through an object or sit unaffected

d. Where waves liko light or sound spread out as they move through a silt, but NOT around an object

8. When does single-slit diffraction occur?

A. when the slit width is smaller than the wavelength

B. when the slit width is the same as the wavelength

C. when the slit width is slightly larger than wavelength

D. both a and b

9. A single narrow slit is illuminated with red light of wavelength 632.8 nm. A screen placed 1.60 m from the slit shows a typical singe-slit diffraction pattern. The separation between the two first minima is 4.0 mm. What is the width of the slit?

A. 0.25 mm

B. 0.51 mm

C. 2.5 mm

D. 5.1 mm

a physics teacher has demonstrated a single slit diffraction experiment to the students with a light source of wavelength 400nm and grating constant of 4000 lines per inch. Compute maximum number of dark fringes observed by him? If he replaces the given grating with another grating (5000 lines per inch) will he observe the same number of dark fringes?