Radiation with wavelength longer than red lights______________?

Related Mcqs:

1. If the wavelength of incident radiation is increased in photoemission then_________________?

   A. The maximum kinetic energy of the photoelectrons increases
   B. The minimum kinetic energy of the photoelectrons decreases
   C. The minimum kinetic energy of the photoelectrons increases
   D. The average kinetic energy of the photoelectrons decreases

2. Gives the definition of metre in terms of wavelength of red cadmium light ___________________?

   A. Newton
   B. Einstein
   C. Michelson
   D. Galileo

3. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?

   A. he/ev
   B. he/Vc
   C. eV/h
   D. impossible to predict

4. The minimum wavelength of X-rays can further be reduced by _______________?

   A. Reducing the pressure or cooling the target
   B. Increasing the temperature of the filament.
   C. Using a target element of higher atomic number
   D. Increasing the potential difference between the cathode and the target

5. The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?

   A. 6.2 x 10-10m
   B. 9.1 x 10-18m
   C. 3.11 x 10-10m
   D. 4 x 10-10m

6. The linear momentum of an X-ray photon of wavelength 0.1A is_______________?

   A. 6.625x1023N-s
   B. 66.25x1023N-s
   C. 662.5x1023N-s
   D. data is insufficient

7. As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?

   A. shifts towards longer wavelength
   B. shifts towards shorter wavelength
   C. remain the same
   D. shifts towards longer as well as shorter wavelengths

8. A transmitting station emits radio waves of wavelength λ at power P. If h is Planck’s constant & c the speed of light what is the rate of emission of photons ?

   A. λ
   B. Speed of sound
   C. Speed of lightB.
   D. h

9. A photon of wavelength 900nm behaves like a particle of mass______________?

   A. 5.53 x 10-36kg
   B. 0 kg.
   C. 2.46 x 10-36kg
   D. 1.84 x 10-44kg

10. What is wavelength of visible spectrum?

    A. 8500 – 9800 angstrom
    B. 7800 – 8000 angstrom
    C. 3900 – 7600 angstrom
    D. 1300 – 3000 angstrom

    Submitted by: Engr Allah Wadhayo