X-ray are________________?
A. of unknown nature
B. high energy electrons
C. high energy photons
D. radio isotopes
A. of unknown nature
B. high energy electrons
C. high energy photons
D. radio isotopes
A. its energy levels are too close to each other
B. its energy levels are too far apart
C. it is too small in size
D. it has a single electron
A. 10-10s
B. 10-8s
C. 10-6s
D. 10-9s
A. Balmer series
B. Pfund series
C. Bracket series
D. Lymann series
A. 18.336
B. 1836
C. 18360
D. 183.6
A. spectrometer
B. galvanometer
C. interferometer
D. none of these
A. Newton
B. Einstein
C. Raleigh
D. Planks
A. object is beyond C
B. if the object is with in C
C. if the object is within f
D. both B and C
A. C = 4fd
B. C = 8fd
C. C = 16fd
D. C = 5/2fd
A. 300km
B. 200km
C. 100km
D. 20km