Light having a frequency in vacuum of 6.0 10^14 Hz enters a liquid of refractive

Question

Light having a frequency in vacuum of 6.0 10^14 Hz enters a liquid of refractive index 2.0. In this liquid, its frequency will be: a) 1.5 10^14 Hz b) 3.0 10^14 Hz c) 6.0 10^14 Hz d) 12 10^14 Hz e) None of the above choices are correct. Magnetic field of a Solenoid A solenoid is wound with 470 turns on a form 4 cm in diameter and 50 cm long. Current flows along the solenoid from its left side to its right side. What does its magnetic field look like? Electromagnetic waves Which of these are NOT electromagnetic waves? a. cosmic rays b. visible light c. TV signals d. Radio signals e. X-Rays Acoustic intensity level. What are the units of acoustic intensity level? a. Watt b. Watt/m^2 c. dB d. N/m^2 e. -10 times Log(Pascal/P_0)

Explanation / Answer

1.

As frequency do not changes hence the correct option is - c.

2.

Magnetic field of solenoid looks like that given in figure B hence correct option is - B.

3.

It is cosmic ray which is not electromagnetic hence correct option is - a.

4.

The units for acoustic intensity are watt/m2 hence the correct option is - b.

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