During a physics experiment, ARAVINTHAN.V and SAIKUMAR were discussing the life time of an electron in a metastable state. What did they conclude?

• 10^-3 sec

• 10^-5 Sec

• 10^-6 sec

• 10^-7 sec

During a science experiment, SUBASH observed that a metastable state can have a lifetime ______.

• more than the higher energy states

• lower than the lower energy states

• Lower than the lower laser level

• Higher than the lower laser level

During a physics experiment, SATHEESHKUMAR observed that an excited state (except metastable state) has a lifetime of about

• 10−3 s

• 10−8 s

• 10−10 s

• 10−12 s

During a science experiment, PRAVEEN observed that the laser beam emitted from the device was in the form of .........

• only continuous waves

• only pulses

• pulses or continuous waves

• all the above

In a science competition, SAI and KISHORE are discussing the energy levels of different ions that are responsible for lasing action. Which of the following ions do they believe is responsible for this phenomenon?

• Al3+

• Cr3+

• Al2O3

• Cr2O3

During a science fair, RUKMINI presented her project on holography. She explained the different types of LASERs used in this fascinating field. Which LASER did RUKMINI mention as being used in holography?

• Ruby

• He-Ne

• Argon ion

• Nd-YAG

In a physics lab, REDDY is experimenting with a He-Ne gas laser. He wants to understand the pumping technique used in this type of laser.

• Forward bias

• Optical pumping

• Electrical discharge

• High injection current.

During a science fair, BHASKAR was curious about the type of laser used most widely in industrial materials processing applications. He asked his friends AMARENDRA and YASWANTH for their opinions.

• Dye Laser

• YAG laser

• Ruby Laser

• Carbon Dioxide Laser

During a science fair, SWATHIKALA presented a project on different types of lasers. She wanted to know which of the lasers have high efficiency.

• Ruby

• Semiconductor

• He-Ne

• CO2

In a Laser Technology class, SAFIKUL asked the students to identify an example of a gas laser. What would be the correct answer?

• Semiconductor Laser

• CO2 Laser

• Nd:YAG Laser

• Dye Laser