Explanation

The simple machine used in a bicycle to travel is the wheel and axle.

This mechanism allows the wheels to rotate efficiently around the axles.

It enabling the bicycle to move forward with ease.

Explanation

Dr. Abdus Salam made significant contributions to the development of quantum electrodynamics and quantum field theory.

His work laid the foundation for the electroweak unification theory, for which he was awarded the Nobel Prize in Physics in 1979.

Explanation

Photosynthesis splits water molecules (H2O) into oxygen (O2) and hydrogen ions (H+), releasing oxygen as a byproduct.

This process is essential for life on Earth, as it provides the oxygen that supports aerobic respiration in most living organisms.

Explanation

Question: A girl throws a small stone into a lake. Waves spread out from where the stone hits the water and travel to the bank of the lake. She notices that ten waves reach the side of the pond in a time of 5.0s. What is the frequency of the waves?

Answer: Frequency is defined as the number of waves (or cycles) per second. In this case, 10 waves reach the bank in 5 seconds, so:

Frequency = Number of waves / Time

= 10 waves / 5 s

= 2 waves/s

= 2.0 Hz

Explanation

Nuclear fusion is a process where two or more light nuclei (atomic nuclei with a small number of protons and neutrons) combine to form a single, heavier nucleus.

This process releases energy, as the resulting nucleus has a higher binding energy than the original nuclei.

Explanation

Question: A powder contains 100mg of a radioactive material that emits α-particles. The half-cycle of the isotope is five days. The mass of isotope that remains after ten days will be?

Answer: The half-life of the isotope is 5 days, which means that every 5 days, half of the remaining material decays. After 10 days, there will be two half-lives:

1. First half-life (5 days): 100mg → 50mg (half of the material decays)
2. Second half-life (next 5 days): 50mg → 25mg (half of theq remaining material decays)

So, after 10 days, 25mg of the original 100mg will remain.

Explanation

Gamma (γ) radiation consists of high-energy electromagnetic waves, such as X-rays or gamma rays, that travel in a straight line and are not affected by electric or magnetic fields.

Gamma radiation is a form of ionizing radiation and can travel several meters in air or several centimeters in dense materials before being absorbed.

Explanation

The radioactive decay equation shows a parent nucleus (91Pa^233) decaying into a daughter nucleus (92U^233) with the emission of a particle.

The parent nucleus has an atomic number of 91 (Protactinium), and the daughter nucleus has an atomic number of 92 (Uranium).

This increase in atomic number indicates that a beta particle (β) has been emitted.

Explanation

The particle that comprises two protons and two neutrons is an alpha particle (α).

Alpha particles are emitted from the nucleus of an atom during a type of radioactive decay called alpha decay or α-emission.

Explanation

When a radioactive nuclide emits a beta (β) particle, it undergoes beta decay.

In beta decay, a neutron in the nucleus is converted into a proton and an electron (the beta particle).

As a result, the atomic number (proton number) of the nucleus increases by 1.