What has to be different to allow refraction to occur?

a. the medium

b. the light

c. the wave

d. the speed

What is the distance traveled by a vehicle in 12 minutes, if its speed is 35 km/h?

Do cosmic rays have color?

If the frequencies of two component waves are 24 Hz an 20 Hz, they should produce beats per second

You will not know this. Really I didn't. What is the darkest known substance.

A 1.85-m3 rigid tank initially contains air whose density is 1.18 kg/m3. The tank is connected to a high-pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 5.

An originally stationary car with a mass of 1500 kg which velocity of 15 m/s, five second after starting. What is the car's acceleration? How much force was required to reach this acceleration

8. A force of 80 pounds on a rope is used to pull a box up a ramp inclined at 100 from the horizontal. The rope forms an angle of 330 with the horizontal. How much work is done pulling the box 25 feet along the ramp?

How many neutrons does element x have if its atomic number is 54 and its mass number is 151?

43 miliohms plus 270000 kiliohms

Why are the coldest places on earth found near the poles