Asample semiconductor has a cross-sectional area of 1 cm and a thickness of 0.2 cm. five watts of electromagnetic radiation at a wavelength of 6200 angstroms are incident on this material. assume that 80% of the photons are successful in generating an electron-hole pair. determine the number of electron-hole pairs generated per unit volume per unit time.

Two friends are having a conversation. anna says a satellite in orbit is in freefall because the satellite keeps falling toward earth. tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . who do you agree with and why?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

Acar travels 40m in 8 seconds find the car speed