Explanation

A spectrometer is an instrument used to measure the properties of light over a specific portion of the electromagnetic spectrum, especially to analyze line spectra produced by atoms or molecules.

It helps identify elements or compounds by detecting their unique emission or absorption lines in the spectrum.

A spectrometer is an instrument used to measure the wavelength of light (or other electromagnetic radiation) by dispersing it into a spectrum.

It is commonly used to analyze the spectral lines of elements, which correspond to specific wavelengths.

Explanation

X-rays are electromagnetic waves and not charged particles, so they are not deflected by electric or magnetic fields.

They travel in straight lines, affect photographic plates, and have properties of electromagnetic radiation.

Explanation

In simple harmonic motion (SHM), the restoring force is given by:

F = -kx

Where:  

- F is the restoring force  

- k is the spring constant  

- x is the displacement from the equilibrium position  

The restoring force is minimum when displacement x = 0, i.e., at the equilibrium position.

Explanation

Change in momentum = 20 − 5 = 15 kg·m/s

Time = 3 s → Force = 15 / 3 = 5 N

Explanation

The Earth bulges at the equator and rotates, creating a centrifugal force that slightly reduces gravity there.

At the poles, this effect is minimal, so ‘g’ is stronger at the poles than at the equator.

Explanation

An electric generator works on the principle of electromagnetic induction.

Faraday's law states that a changing magnetic flux induces an emf, which is the working principle of generators.

Explanation

Kinetic energy (K) is related to momentum (p) by K = p² / 2m. If momentum increases by 20%, the new momentum p' = 1.2p.

The new kinetic energy K' = (p')² / 2m = (1.2p)² / 2m = 1.44p² / 2m = 1.44K.

The percentage increase in K.E is ((K' - K) / K) × 100 = ((1.44K - K) / K) × 100 = 44%.

Explanation

The ratio of output voltage to input voltage in a transistor circuit is called the voltage gain.

It measures how much the amplifier increases the input signal voltage.

Explanation

Waves produced by oscillation of material particles require a medium to travel, called mechanical waves.

Examples include sound waves and water waves.

Explanation

Emmerson Mnangagwa is the current president of Zimbabwe Since 2017.

He replaced Robert Mugabe. 

He is the third president of Zimbabwe 

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Updated & verified on 09-09-2025