HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

What is the shape of wavefront for point source?

What is the shape of wavefront for line source?

Give the definition of intensity of light according to quantum concept and its unit.

How will you define threshold frequency?

What is a photocell?

Mention the different types of photocells.

Define stopping potential.

What is a surface barrier?

Mention the two features of x-ray spectra, not explained by classical electromagnetic theory.

Briefly discuss the observations of Hertz, Hallwachs and Lenard.

Explain the effect of potential difference on photoelectric current.

Explain how frequency of incident light varies with stopping potential.

List out the laws of photoelectric effect.

Explain the quantum concept of light.

Obtain Einstein’s photoelectric equation with the necessary explanation.

Explain experimentally observed facts of the photoelectric effect with the help of Einstein’s explanation.

Give the construction and working of photo emissive cell.

List out the characteristics of photons.

Give the applications photocell.

How many photons per second emanate from a 50 mW laser of 640 nm?