19.
Laser is a
Answer : C. coherent waves
20.
Arrange the discending order of wave length (long to short) I. Infra-red II. Ultra violent III. Gamma rays IV. Micro waves
Answer : A. IV,I,II,III
21.
why does diamond shine at night?
Answer : D. It has tetrahedral molecular structure
22.
X-rays travel with the velocity of
Answer : A. light
23.
Waves produced on the surface of water is
Answer : B. transverse
24.
The electromagnetic spectrum spans over __________ of magnitude of photon energy
Answer : A. 15 orders