There are three substances Silver, Tungsten, And Platinum
Silver weighs 35.4 grams
Tungsten weighs 65.1 Grams
Platinum Weighs 72.4 Grams
All of these are cubes and are each 1 1/2 centimeters tall

There are three cubes of varying sizes 1, 2, and 3
1 weighs 112.6 grams and is 1 8/10 centimeters tall
2 weighs 111.7 grams and is 2 2/10 centimeters tall
3 weighs 2.7 grams and is 5/10 centimeters tall

Pair 1, 2, and 3 to the right substances.
Explain how you did it.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

wavelength divides in half and speed stays the same.

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