1. While conducting a photoelectric effect experiment with a light of a certain frequency. It is found that the reverse potential difference of 1.25 volt is required to reduce the current to zero. Find the maximum kinetic energy

1. In a photoelectric effect experiment, a light with a wavelength of 400 nm is incident on a metal surface which has a work function of 2.0 eV. Calculate the threshold frequency

A capacitor has a rms current of 21 mA at a frequency of 60 Hz when the rms voltage across it is 14 V.

What is the capacitance of the capacitor?

Resonance occur in RCL circuit when ?

A 22.5 mH inductor, a 105 W resistor and a 32.3 mF capacitor are connected in series to the alternating source 240 V, 50 Hz. Calculate the power factor of the circuit.

A dentist uses a small mirror attached to a thin rod to examine one of your teeth. When the tooth is 1.20 cm in front of the mirror, the image it forms is 9.25 cm behind the mirror. Determine the focal length of the mirror

A person of 1.60 m height stands 0.60 m from a surface of a hanging shiny globe in a garden. Given the radius of the globe is 9.0 cm, where is the image of the person relative to the surface of the globe?

A biconvex lens is made of glass whose index of refraction is 1.6. The lens has a radius of curvature of 30 cm for one surface and 40 cm for the other. What is the focal length of the lens ?

How would you expect the interference pattern of a double-slit experiment to change if white light is used instead of monochromatic light?

Light from a sodium lamp with a wavelength of 598.3 nm is shone normally on a soap film. If the film has an index of refraction n = 1.40 and is suspended in the air ( n= 1.00), find the minimum thickness for which it appears black in reflected light ?

White light is incident on a soap film of refractive index 1.30 in air. The reflected light looks bluish because the red light of wavelength 670 nm is absent in the reflection. What is the minimum thickness of the soap film?

A monochromatic light of unknown wavelength falls normally on a diffraction grating. The diffraction grating has 3000 lines per cm. If the angle between the center and the first order maxima is 17.5°. Calculate the wavelength of the light,

Calculate Binding energy per nucleon

Calculate the binding energy per nucleon of neon-20 nucleus in MeV per nucleon.

Calculate energy released in MeV

(Given mass of Po-212, mPo=211.98885 u ; mass of Pb-208, mPb=207.97664 u and mass of He, mHe=4.0026 u)

A radioactive nuclide A disintegrates into a stable nuclide B. The half-life of A is 5.0 days. If the initial number of nuclide A is 1.0´1020, calculate the number of nuclide B after 20 days.

Spontaneous means it happen by itself without external

stimuli. The decay is not affected by the physical conditions

and chemical changes.

Living wood takes in radioactive carbon-14 from the atmosphere during the process of photosynthesis, the ratio of carbon-14 to carbon-12 atoms being 1.25 to 1012. When the wood dies the carbon-14 decays, its half-life being 5600 years. 4 g of carbon-14 from a piece of dead wood gave a total count rate of 20.0 disintegrations per minute. Determine the age of the piece of wood.

Given NA =6.02 x 10²³ mol-1