Choose the right answer: i) In scanning tunneling microscopy (STM) a. the tip is heated to generate electrons b. the force between the tip and the specimen is measured c. electrons from the tip are accelerated with high velocity to reduce the wavelength d. none of them
Choose the right answer:
i) In scanning tunneling microscopy (STM)
a. the tip is heated to generate electrons
b. the force between the tip and the specimen is measured
c. electrons from the tip are accelerated with high velocity to reduce the wavelength
d. none of them
ii) Magnetic Resonance Imaging based on magnetic nanoparticles (MNP) is useful because:
a .MNP are paramagnetic
b. MNP are ferromagnetic
c. MNP have a good optical absorption
d. None of them
iii) TIO2 is a semiconductor with a band gap of 3.2 eV, which corresponds to UV region of the light spectrum. To improve its efficiency, TiO2 is doped with hydrogen to :
a.Extend photo-response to the visible region
b. Reduce the reflected light
c . Generate more heat
d. Increase the band gap
iv) In quantum tunneling, there must be:
a.Two semiconductors separated by a conductor
c Two conductors separated by an insulator
b. Two insulators separated by a conductor
b.Two conductors separated by another different conductor
v)To increase the efficiency of photovoltaic cell, one can
a.Increase the absorption of the light
b. Make the semiconductor material very thick
c. All of them
d. Use semiconductor materials with large energy gap
Step by step
Solved in 3 steps
