Which of the following is not equal to 435 dm?
4.35 x 104 mm
4350 cm
0.435 km
4.35 x 107 m

Option C, 4350 cm

Explanation:

One deci meter is equal to ten centi meter,

Given value of length deci meter

Deci meter is a unit higher than centi meter and hence in order to convert a higher order unit to a small order unit, it must be multiplied by ten or the equivalent.

Thus, measured values in centi meters is equal to

Value is deci-meter

4350 centi meters.

Option C is correct

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.