physics

A tuning fork sounds louder when its stem is pressed against a table top than when held in air because?

A. a larger mass of air is set vibrating by the table top B. the whole table vibrates in resonance…

5 years ago

A bat emits a sound wave at a speed of 1650.0ms−¹ and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector.

A. 8.75m B. 16.50m C. 87.75m D. 123.75m E. 330.00m Correct Answer: Option D - 123.75m Explanation Distance x =…

5 years ago

When the direction of vibration of the particles of a medium is perpendicular to the direction of travel of a wave the wave transmitted is known as?

A. sound wave B. transverse wave C. longitudinal wave D. stationary wave E. mechanical wave Correct Answer: Option B -…

5 years ago

Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?

A. Wrapping it in cotton wool B. painting it black C. Placing it in a vacuum D. Placing it on…

5 years ago

Heat transfer by convection in a liquid is due to the?

A. translatory motion of the molecules of the liquid B. increased vibration of the molecules of the liquid about their…

5 years ago

How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg−¹k−¹ cools from 85°C to 25°C?

A. 1.38 x 10^6 J B. 2.53x10^4J C. 7.66x10³J D. 1.38x10³J E. 1.27 X10³J Correct Answer: Option D - 1.38x10³J…

5 years ago

lf the temperature of a small quantity of water in a closed container is gradually increased from 0° to 40°C then the density of the water within this range?

A. increases for a while and then decreases B. decreases for a while and then increases C. increases gradually D.…

5 years ago

The temperature of X will rise higher than that of Y only if the?

Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical…

5 years ago