Quantum of electromagnetic energy is called
A) particles
B) photons
C) waves
D) energy
Correct Answer:
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Q3: In dark, LDR has
A)low resistance
B)high current
C)high resistance
D)both
Q4: Electrons show diffraction effects because their de
Q5: Characteristic properties of waves are
A)reflection
B)refraction
C)interference
D)all of above
Q6: Plank's constant has units {{}}
A)J
B)s
C)J s-1
D)J s
Q7: Gas atoms that exert negligible electrical forces
Q9: In photoelectric effect, electrons should be removed
Q10: Light interacts with matter as
A)wave
B)particle
C)both A and
Q11: When white light is passed through cool
Q12: Wavelength of ultraviolet region of electromagnetic spectrum
Q13: In an insulator, the valence band is
A)fully
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