short question for basic

.Write TRUE or FALSE for each of the following statements. (4 marks)
(a)Only a virtual image smaller than the object is formed by a convex mirror.
(b)An atom consists of a core call the nucleus around which the particles called protons
are moving.
(c) Sound waves can travel through vacuum.
(d)The specific heat capacity of water is 4619 J Kg-1 K-1.
Fill in the balnks with a suitable word or words. (4 marks)
(a)When an object is at the centre of curvatureof a concave mirror the magnification is
________ .
(b)The distance between the pole and the focus of a concave or convex mirror is called
the ________ of a concave or convex mirror.
(c) The velocity of light in air is _____ ms-1.
(d) The electrons closer to the nucleus are called _____ electrons.
. (a) State the laws of reflection of light. Find the wavelength of a wave with frequency 1000 Hz and velocity
344 ms-1. (3 marks )
(b) A concave mirror can produce an image which is twice the size of the object. Draw a ray diagram to show
this. (3 marks )