Motion in a Straight Line — Physics STD 11 Science — Question

The X-ray coming from a Coolidge tube has a cutoff wavelength of 80pm. Find the kinetic energy of the electrons hitting the target.

A truck and a car with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?

Two particles A and B start from rest and move for equal time on a straight line. The particle A has an acceleration a for the first half of the total time and 2a for the second half. The particle B has an acceleration 2a for the first half and a for the second half. Which particle has covered larger distance?

What should be the minimum number of unequal forces acting on a particle such that the resultant force becomes zero?

The speedometer of bus measures the average speed or of instantaneous speed?

Fill in the blanks using the word (s) from the list appended with statement: For a fluid in steady flow, the increases inflow speed at a constriction follows from…… while the decrease of pressure there follows from….....(conservation of mass/ Bernoulli’s principle).

Black body radiation is white. Comment.

White clothes are more comfortable in summer while colourful clothes are more comfortable in winter. Why?

What does SONAR stand for?