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X -rays Electromagnetic waves can transmit various types of radiation. An astronomer used a special telescope that detected a frequency of 1.2 x 10 ^ 12 Hz . What was the astronomer observing?

A. X-rays
B. Gamma rays
C. Infrared rays
D. Visible light

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

It can take some of those large , industrial vehicles up to feet to stop when traveling only 60 mph, and therefore , you shoukd be mindful to not be jn the traffic right in front of them a. 100 feet b. 200 feet c. 335 feet d. 425 feet