Ron standing 1m far from a sensor moves away from the sensor for ron then halts for 2 seconds, and notes down these values. ron then walks to where the sensor was kept at a speed of 3m/s for the next 2 seconds a) draw a position time graph for this. [x - axis -time (s) y-axis position (m)] b) find out the distance from the sensor at time t 4 seconds. c) calculate the slope at t-6 seconds d) what you infer from the value obtained in (c)?

see earlier answer

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