Question

Lasers emit light of a certain frequency in one, precise direction. The light that a laser emits can be tuned to have a high frequency and energy. Lasers that emit high-energy light are often used
A.
as compact disc readers.
B.
as scalpels in surgical procedures.
C.
as transmission devices in television remote controls.
D.
as pixels in plasma television displays.

Answer 1

B. as scalpels in surgical procedures.

High-energy lasers (e.g., CO2, Nd:YAG) are used in surgery because their concentrated, high-frequency light can precisely cut or vaporize tissue. The other choices use low-power or different technologies (CDs and remotes use low-power infrared lasers/LEDs; plasma TVs use gas discharges).