sketch the graphs of intensity against wavelength for a black body radiations at temperatures 100k and 200k on the same axis

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

What are similarities and differences of reflection, refraction, diffraction and absorption?

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction