When parallel light rays exit a concave lens, the light rays

diverge

converge

come together

remain parallel

2. A sound wave in a steel rail has a frequency of 620 Hz and a wavelength of 10.5 m. What is the speed of sound in steel?

Change the speed 0.200 cm/s to units kilometers per year

One of the element carbon combines with one of the element oxygen to form one of the compound carbon dioxide.

This gas is found in small quantities in the lower layers of the stratosphere this gas is extremely important because it absorbs ultraviolet radiation A. Argon B. Carbon dioxide C. Nitrogen D. Ozone

In order that a train stop safely it'll always pass a signal showing yellow light

The voltage across the primary winding is 350,000 V, and the voltage across the secondary winding is 17,500 V. If the secondary winding has 600 coils, how many coils are in the primary winding? 30 583 12000 332500

A 200 watt t. v. is used for 20 hours in a week. If it is used for four weeks then what is cost of electricity if rate is 5rs/kwh

In an experiment, the control is never changed by the scientist not important to the scientist not recorded by the scientist changed by the scientist

When you catch a baseball, what kind of work do you do, negative or positive? by catching the ball, what do you change? what energy does it gain or lose?

All describe work except A) a team of dogs dragging a sled B) a jokey sitting on a horse C) a bowler lifting a bowling ball