The temperature at 5 p. m. is 20 degree. the temperature at 10 p. m. - 5 degree. how many degrees did the temperature fall

A laser used to dazzle the audience at a rock concert emits blue light with a wavelength of 463 nm. calculate the frequency of the light.

Is a spectral line with wavelength 656.5 nm seen in the absorption spectrum of hydrogen atoms?

Anyone want to get a conversation going again? lol

The speed of sound is 330 m/s and the wavelength of a particular sound wave is 33 meters. Calculate the period of this wave.

The states that mas cannot be created or destroyed

Which type of wave experiences a change in speed when entering a new medium? a) only sound waves b) both sound and light waves c) only light waves d) neither sound or light waves

Three basic classes of collisions include all but which of the following?

How does the use of biomass energy to create electricity harm the environment

Which physical property of iron made it popular for use in weapons? 1. Magnetism 2. Luster 3. Malleability 4. Ductility

a 2 kg rock is dropped from the top of a 30 m High building calculate the ball at the time that it strikes the ground