A scientist wants to place a satellite into orbit around Earth. Take Earth's mass to be 5.975 1024kg and radius to be 6.371 106 m. (a) If the scientist wants the radius of the orbit to be 7 106 m:
i. What is the speed of the satellite?
ii. What is the period of the orbit?
(b) If the scientist wants the period of the orbit to be 1 day
i. What must the radius of the orbit be?
ii. What is the speed of this orbit?

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m