Question 1 (1 point) A wave on a string has an equation y(x, t) = (0.15 m)sin(5.0x - 25t + -) Assuming all values are in the appropriate SI units, what is the speed of this wave? 2 m/s O 5.0 m/s 7.0 m/s O 18 m/s O 35 m/sQuestion 2 (1 point) A wave has an equation of y(x,t) = (0.193 m) cos ( (4.47x10^2)t - (6.700x10^2)x ) Assuming all parameters are in SI units, calculate the frequency of the wave in Hz to 3 sf. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 AnswerQuestion 3 (1 point} When light is diffracted around an obstacle like a penny, at the centre of the image of the penny there will be a diffuse spot -- dark spot bright spot Question 10 (1 point) You measure the maximum wavelength of the radiation from a star as (4.9x10"2) nm, and the radius of the star to be (4.30x10"8) metres. Find the total power emitted by the star in Watts. assuming it is a perfect black-body emitter. Use 2 sf in your answer. Hint: Use Wien's Law to nd the temperature, and then Stefan's Law. You can assume the star is a sphere. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: Question 9 (1 point} A star, acting as a perfect black-body, with a surface area of (1.9x10A18} m2 has a surface temperature of (5.56x10A3) K. What is the power output in watts, to 2 sf? Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 C]