physics

When a metal surface is irradiated, photoelectrons may be ejected from the metal. The kinetic energy of the ejected electrons depends on the?

A. source of the radiation B. intensity of the radiation C. detection device for the electrons D. amplitude of the…

5 years ago

Calculate the height of the plane above the ground?

Plane as 63cm of HG while a ground observer records a reading of 75cm of Hg with his barometer. assuming…

5 years ago

Which of the following statements is not correct? Isotopes of an element have?

A. the same number of electric charges on the nucleus B. the same chemical properties C. different nucleon numbers D.…

5 years ago

Which of the following statements about viscosity is/are correct? when a ball falls through a viscous liquid?

i. viscosity opposes the gravitational force on the ball. ii. viscosity opposes the upthrust on the ball. iii. viscosity is…

5 years ago

The unit of stress is?

A. Nm B. N C. Nm−² D. Nm² E. Nm¹ Correct Answer: Option C - Nm−²

5 years ago

An induction coil is generally used to?

A. rectify an alternating current B. produce a large input voltage C. smoothen a pulsating direct current D. modulate an…

5 years ago

The diagram below shows a current-carrying wire between the poles of a magnet. In which direction would the wire tend to move?

A. into the paper B. out of the paper C. towards the north pole of the magnet D. towards the…

5 years ago

Calculate the number of turns in the secondary coil of the transformer?

A house is supplied with a 240V a.c mains. To operate a door bell rated at 8v, a transformer is…

5 years ago

A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

A. 2.81jg−¹ B. 6.25Jg−¹ C. 8.89Jg−¹ D. 168.75Jg−¹ E. 5333.33Jg−¹ Correct Answer: Option D = 168.75Jg−¹ Explanation pt = ml…

5 years ago

Using the data in the circuit illustrated below. Calculate the value of R.

A. 0.02Ω B. 0.05Ω C. 5.00Ω D. 20.00Ω E. 50.00Ω Correct Answer: Option E - 50.00Ω Explanation R = VT=2v/40×10−³…

5 years ago